1956 -999.0 -999.0 -12.2 -17.5 -18.5 -17.1 -20.1 -24.6 -18.8 -18.0 -9.6 -3.9 1957 -3.0 -8.1 -12.5 -11.7 -17.9 -18.2 -20.2 -17.7 -17.7 -14.2 -11.6 -4.9 1958 -5.3 -9.1 -12.8 -15.1 -14.7 -23.4 -18.9 -22.3 -23.7 -18.2 -11.3 -6.4 1959 -5.2 -10.2 -11.5 -15.6 -16.7 -18.5 -20.6 -20.6 -25.3 -15.3 -12.8 -4.6 1960 -5.4 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -19.7 -18.5 -10.7 -6.1 1961 -5.2 -7.4 -12.4 -15.2 -15.8 -18.6 -1.3 -17.8 -16.8 -17.5 -11.0 -8.3 1962 -7.5 -8.2 -13.7 -18.3 -22.2 -20.4 -23.6 -21.6 -19.6 -15.6 -10.1 -6.5 1963 -4.3 -9.7 -15.4 -20.0 -21.5 -17.1 -22.0 -18.4 -18.6 -19.4 -12.6 -7.8 1964 -4.7 -8.4 -14.3 -19.2 -21.4 -17.3 -21.2 -18.4 -25.9 -17.4 -8.5 -4.1 1965 -3.5 -6.6 -13.9 -17.9 -17.9 -22.4 -21.5 -20.7 -17.0 -17.0 -1.6 -5.3 1966 -5.9 -7.6 -9.8 -15.9 -17.1 -20.6 -15.3 -23.6 -21.1 -18.5 -9.7 -5.4 1967 -3.1 -10.0 -12.6 -16.1 -18.3 -16.4 -16.9 -22.2 -18.1 -19.8 -9.1 -5.3 1968 -5.8 -8.9 -12.5 -17.9 -18.4 -16.2 -21.6 -20.3 -21.2 -14.9 -9.7 -6.2 1969 -3.5 -8.5 -12.7 -17.8 -22.2 -17.9 -22.7 -27.9 -19.8 -15.3 -13.2 -5.7 1970 -4.3 -8.7 -12.4 -15.1 -15.6 -20.1 -21.6 -20.4 -18.6 -16.4 -8.4 -4.2 1971 -3.1 -7.5 -13.7 -15.8 -15.6 -18.0 -20.4 -18.3 -17.6 -15.0 -10.6 -4.7 1972 -2.7 -8.3 -12.6 -15.0 -22.7 -14.8 -20.3 -15.4 -21.0 -20.9 -12.1 -6.5 1973 -4.5 -9.2 -15.4 -13.4 -16.8 -15.2 -22.7 -19.2 -17.2 -15.6 -8.0 -6.4 1974 -2.5 -9.9 -13.8 -17.6 -18.7 -17.3 -19.7 -16.3 -20.6 -11.1 -8.8 -2.6 1975 -2.8 -9.0 -12.1 -19.1 -14.5 -16.8 -18.5 -23.6 -22.8 -17.1 -8.4 -6.4 1976 -3.5 -8.2 -14.7 -19.5 -22.1 -16.0 -19.9 -24.6 -19.9 -13.7 -9.2 -3.6 1977 -2.0 -7.4 -11.5 -16.7 -17.0 -19.6 -19.4 -18.8 -25.2 -19.3 -11.8 -4.8 1978 -5.5 -8.0 -12.6 -16.9 -17.2 -16.3 -18.0 -23.5 -20.8 -19.6 -9.4 -4.8 1979 -6.1 -9.2 -13.8 -15.2 -18.3 -19.5 -22.7 -21.6 -21.0 -16.2 -10.4 -4.0 1980 -4.4 -8.7 -10.3 -13.5 -18.3 -20.6 -14.0 -17.5 -17.8 -17.2 -8.0 -5.5 1981 -5.1 -9.2 -11.1 -18.1 -20.1 -19.6 -17.4 -14.2 -17.7 -17.3 -10.4 -6.0 1982 -5.1 -9.1 -16.3 -20.8 -16.4 -23.1 -15.7 -27.7 -25.0 -16.7 -10.7 -3.8 1983 -3.1 -6.8 -14.0 -15.2 -15.4 -16.7 -23.0 -20.0 -17.2 -18.0 -13.5 -6.0 1984 -2.9 -7.4 -12.2 -14.0 -15.4 -19.9 -21.0 -18.1 -18.9 -20.4 -12.1 -4.5 1985 -3.3 -9.5 -11.3 -14.4 -20.8 -16.9 -25.1 -20.2 -20.2 -17.3 -11.8 -7.6 1986 -5.9 -3.9 -12.0 -16.0 -16.9 -22.3 -22.2 -19.6 -18.1 -14.2 -11.0 -5.8 1987 -3.7 -8.4 -14.6 -17.2 -21.1 -17.6 -17.1 -25.4 -19.9 -15.6 -11.0 -5.1 1988 -3.9 -8.9 -12.1 -17.3 -12.5 -16.5 -20.9 -18.5 -18.3 -13.3 -11.5 -7.1 1989 -6.0 -9.7 -15.7 -18.6 -21.6 -19.6 -20.3 -16.7 -14.2 -11.4 -14.3 -2.7 1990 -4.7 -9.4 -14.1 -14.3 -16.4 -21.3 -19.3 -20.2 -21.0 -999.0 -11.1 -5.2 1991 -5.7 -7.1 -12.1 -13.1 -18.4 -14.2 -15.6 -17.0 -21.7 -15.6 -9.6 -3.6 1992 -3.6 -6.2 -12.3 -18.0 -19.6 -17.8 -24.6 -19.6 -23.2 -16.7 -11.7 -8.2 1993 -6.4 -6.6 -13.7 -17.5 -22.7 -21.7 -23.6 -22.4 -20.0 -18.0 -12.4 -8.6 1994 -6.7 -9.1 -14.7 -19.7 -21.1 -14.4 -18.6 -23.8 -16.8 -15.0 -12.1 -7.2 1995 -9.0 -9.7 -12.9 -18.2 -21.4 -19.4 -11.1 -17.2 -20.0 -17.7 -9.6 -6.4 1996 -5.5 -8.0 -12.9 -15.4 -21.1 -17.0 -16.7 -15.6 -16.9 -15.9 -9.1 -5.4 1997 -5.2 -7.5 -11.7 -19.3 -18.0 -14.9 -20.0 -21.3 -18.1 -16.9 -10.3 -4.1 1998 -4.8 -9.1 -15.3 -20.8 -19.6 -18.7 -23.6 -18.2 -21.7 -19.6 -9.1 -5.7 1999 -10.5 -10.2 -13.4 -18.4 -21.3 -16.3 -20.8 -20.0 -21.5 -16.1 -12.5 -7.9 2000 -6.0 -9.0 -14.0 -15.0 -21.2 -19.4 -18.6 -18.2 -15.6 -19.3 -7.9 -6.0 2001 -4.3 -8.7 -11.4 -16.0 -16.3 -19.6 -16.6 -21.6 -19.7 -18.1 -10.1 -6.3 2002 -3.7 -9.5 -10.4 -13.6 -14.5 -15.7 -16.5 -21.1 -18.1 -15.1 -10.6 -7.4 2003 -4.2 -5.7 -12.1 -16.2 -19.6 -18.4 -23.9 -20.5 -17.5 -16.0 -10.2 -4.6 2004 -2.7 -5.8 -12.5 -16.6 -15.5 -19.2 -24.2 -18.3 -20.8 -14.2 -9.7 -3.2 2005 -3.2 -8.6 -12.6 -18.0 -18.9 -17.2 -22.3 -20.0 -10.0 -16.3 -10.2 -2.2 2006 -4.9 -9.4 -10.0 -11.5 -24.0 -19.1 -20.6 -17.2 -20.1 -17.4 -9.8 -5.4 2007 -4.0 -7.2 -10.9 -15.1 -13.3 -16.6 -13.1 -16.6 -17.8 -17.0 -8.4 -7.2 2008 -6.1 -9.0 -13.6 -15.8 -15.5 -18.0 -17.9 -22.9 -22.1 -17.8 -10.0 -5.6 2009 -5.5 -7.3 -12.5 -17.3 -14.6 -17.6 -16.3 -19.4 -15.7 -16.5 -10.1 -5.9 2010 -3.2 -8.0 -13.4 -19.0 -19.3 -17.1 -23.4 -23.8 -16.1 -16.5 -12.8 -4.6 2011 -3.2 -11.3 -11.6 -14.5 -19.4 -20.6 -16.6 -16.6 -19.1 -18.1 -11.6 -7.0 2012 -5.1 -9.3 -13.4 -15.6 -20.0 -19.2 -23.9 -21.3 -19.6 -14.2 -9.9 -4.6 2013 -3.0 -8.3 -15.5 -17.9 -18.4 -17.2 -19.7 -20.5 -13.2 -15.7 -9.5 -6.1 2014 -3.6 -7.3 -15.0 -18.7 -16.9 -21.1 -21.1 -22.1 -15.1 -14.7 -7.7 -5.5 2015 -4.6 -7.7 -13.8 -21.5 -24.3 -18.4 -23.7 -21.0 -20.0 -18.3 -10.8 -5.5 2016 -5.6 -9.6 -15.4 -17.2 -16.9 -22.5 -21.7 -17.4 -22.8 -15.5 -7.6 -3.6 2017 -3.7 -7.3 -12.8 -16.7 -17.8 -24.0 -18.8 -19.7 -21.6 -17.3 -10.4 -7.8 2018 -4.9 -7.9 -15.2 -13.7 -17.8 -17.3 -15.7 -19.5 -21.5 -17.1 -11.2 -6.3 2019 -5.4 -7.5 -14.4 -17.0 -19.2 -20.7 -18.4 -16.8 -20.0 -16.9 -9.3 -5.0 2020 -3.0 -7.9 -14.4 -13.2 -16.9 -999.0 -17.5 -17.2 -15.2 -14.2 -9.1 -6.5 2021 -6.5 -7.8 -11.5 -17.9 -20.1 -21.2 -18.9 -15.7 -17.9 -13.7 -12.7 -4.4 2022 -6.0 -8.3 -12.2 -17.8 -15.7 -16.2 -19.5 -20.7 -19.5 -12.9 -12.3 -6.2 2023 -5.9 -7.4 -13.3 -14.6 -21.1 -18.9 -22.7 -24.2 -16.5 -16.7 -11.4 -7.0