1968  -999.0  -999.0     5.0     6.9     6.4     7.2     6.2     6.9     8.2     6.8     5.1     4.2
1969     5.8     7.1     6.8     7.8     6.3     8.2     8.0     7.4     7.6     8.6     9.0     6.6
1970     5.4     7.0     6.9     7.6     6.3     7.5     7.4     6.6     7.6     6.5     7.2     7.2
1971     6.0     6.0     6.5     6.5     6.9     7.0     7.5     9.2     7.4     8.0     6.4     7.8
1972     7.5     7.4     7.5     7.5     7.0     7.4     8.6     6.4     7.8     6.4     7.4     7.7
1973     5.7     6.4     8.3     8.6     8.1     6.8     7.4     8.9     8.4     8.2     6.6     5.8
1974     6.0     8.1     7.4     9.5     8.2     7.1     8.1     9.2     9.2     8.8     6.6     6.1
1975     7.1     6.6     7.4     9.6     7.6     6.9     6.1     8.2     7.4     8.3     7.3     6.7
1976     6.0     7.3     6.4     7.0     8.1     7.1     7.1     8.6     8.8     8.4     6.6     6.1
1977     6.7     7.5     7.2     7.0     9.1     8.4     5.0     7.6     8.4     8.6     6.0     7.2
1978     6.2     7.7     6.9     6.2     6.2     8.9     5.7     7.7     7.5     8.7     6.1     7.2
1979     6.3     6.2     7.3     9.1     5.3     7.8     7.8     7.4     6.8     8.0     7.3     6.7
1980     6.0     6.8     6.6     7.8     5.6     8.7     4.9     6.4     6.1     6.7     7.2     5.4
1981     6.0     6.5     6.0     7.4     8.0     7.0     8.1     8.4     7.8     7.0     8.0     6.7
1982     6.2     6.4     8.3     8.7     8.5     7.4     8.7     7.9     8.0     8.0     7.1     7.0
1983     7.5     7.0     7.5     6.9     8.1     7.9     9.1     7.9     7.4     8.4     7.9     7.0
1984     6.1     7.5     7.0     8.6    10.4     7.6     8.5     8.7    10.0     7.6     6.9     6.8
1985     8.2     7.0     6.8     7.7     8.1     7.4    10.0     7.9     9.3     8.5     6.6     6.5
1986     7.0     6.5     7.0     6.1     8.6     8.2     7.0     7.7     8.0     7.4     7.0     7.4
1987     6.8     6.3     7.7     7.2     8.3     7.7     6.6     7.4     7.9     9.0     8.6     6.6
1988     6.0     6.9     7.5     6.4     6.1     8.9     7.0     6.3     7.2     8.2     6.9     6.6
1989     6.3     6.3     7.9     8.3     8.9     8.3     8.9     8.0    10.1    10.0     6.2     6.4
1990     6.9     6.9     7.8     7.9     6.1     8.0     7.4     8.7     7.7     7.7     8.4     5.7
1991     7.2     7.6    13.4     7.0     6.7     6.8     6.9     7.7     6.9     8.1     7.8     6.9
1992     6.2     6.9     6.6     6.5     7.6     6.3     7.5     6.6     8.0     7.3     7.4     6.5
1993     6.0     6.3     7.2     7.7     9.0     7.9     7.0     7.2     8.8     9.3     7.9     5.3
1994     6.9     8.2     7.4     6.6     5.4     6.1     7.0     7.5     7.2     6.9     5.9     5.4
1995     5.7     6.1     7.0     7.2     8.3     7.5     8.5     8.6     8.2     8.0     7.4     6.9
1996     8.0     7.2     7.3     6.9     8.7     8.4     9.4     6.9     8.4     8.3     8.3     6.4
1997     6.1     5.2     7.4     6.7     7.1     6.6     6.8     7.8     6.4     7.3     6.4     4.9
1998     5.8     5.8     6.2     8.7     6.0     6.1     7.7     7.9     7.7     7.9     7.7     6.5
1999     6.4     7.0     7.0     7.4     6.8     8.0     7.6     9.3     7.6     8.6     7.4     6.4
2000     6.6     6.0     7.7     8.0     6.8     7.7     5.6     7.3     8.7     7.9     5.5     6.7
2001     6.0     8.2     7.9     7.2     7.3     8.0     6.6     9.9     8.3    10.8     8.4     8.8
2002     6.7     7.6     5.7     7.2     7.3     7.0     6.3     6.6     6.6     8.2     6.0     6.8
2003     5.7     6.7     7.5     7.5     7.7     8.9     7.6     9.0     7.3     8.6     6.2     6.3
2004     6.0     5.9     6.8     7.1     7.3     7.1     9.3    10.0     8.6     8.8     7.6     7.4
2005     5.2     8.2     7.5     6.1     5.1     7.2     6.1     7.2     6.2     8.2     7.3     6.4
2006     5.3     6.6     7.2     6.1     8.7     6.5     7.5     6.8     7.5     7.7     6.8     7.0
2007     5.9     5.5     6.3     7.1     6.7     6.4     5.8     7.9     6.5     8.5     6.2     6.6
2008     6.4     7.0     6.7     7.7     7.2     8.2     7.8     8.4     7.6     7.6     7.0     8.5
2009     6.5     6.8     6.9     6.6     8.5     6.6     6.2     6.2     7.7     9.5     6.7     6.9
2010     6.8     7.4     8.0     8.5     8.4     9.2     8.4     7.1     7.6     9.5     8.3     7.5
2011     6.8     7.8     7.4     7.5     7.2     8.1     5.3     4.3     7.6     7.8     8.1     7.4
2012     6.5     6.9     6.6     8.5     6.2    10.2     6.9     8.1     8.9     7.9     6.9     4.4
2013     6.8     6.5     6.9     8.2     7.9     7.0     7.8     9.1     6.9     7.6     7.4     5.3
2014     6.0     6.7     7.5     7.6     8.4     8.1     7.8     7.9     6.5     8.7     8.8     6.1
2015     6.1     6.4     6.9     6.7     6.8     8.0     6.8     7.2     9.1     8.4     8.5     7.2
2016     6.6     7.2     7.5     8.3     6.1     6.8     5.9     6.5     9.4     6.8     6.2     5.1
2017     6.0     6.7     6.1     7.1     6.9     8.9     8.7     8.4     9.8     7.7     6.0     6.2
2018     5.6     6.5     7.6     7.5     7.0     6.6     7.8     8.0     8.0     7.2     7.7     7.0
2019     5.5     5.4     6.5     7.9     7.3     7.3     5.2     6.4     8.5     8.5     7.2     5.4
2020     5.0     6.3     7.0     7.6     5.8     6.0     7.1     9.9     7.4     7.3     8.1     6.8
2021     7.0     7.4     7.6     7.3     7.7     6.6     7.0     8.3     8.9     9.0     7.4     9.6
2022     6.0     6.7     7.2     7.4     7.9     8.1     7.3     8.0     9.2     8.2     9.5     6.8
2023     7.6     6.2     6.8     7.0     7.5     7.6     7.2     7.6     7.5     9.2     7.7     6.3