1971 -999 -999 983.0 987.4 999.3 990.7 992.0 993.3 982.7 988.3 988.8 995.1 1972 993.3 989.0 990.8 992.2 989.7 996.3 990.5 996.4 985.4 976.9 983.2 992.1 1973 996.1 988.6 984.1 986.7 993.1 987.4 988.2 983.6 982.5 979.7 983.7 986.0 1974 993.0 981.2 982.5 986.3 987.8 991.9 991.8 994.5 978.6 985.8 992.4 994.1 1975 994.2 987.9 986.9 982.6 997.8 989.6 995.4 979.3 974.9 981.4 985.0 993.5 1976 991.7 990.9 983.0 979.9 988.6 988.1 984.5 986.5 980.9 982.6 989.8 1003.3 1977 995.6 986.4 987.0 988.5 994.3 992.8 990.8 990.8 977.9 973.7 980.9 990.1 1978 987.0 986.8 984.1 987.2 990.4 990.3 1001.4 980.1 984.4 981.7 986.0 989.5 1979 989.1 983.9 980.5 984.9 984.6 982.5 979.4 991.0 980.2 983.7 984.2 992.4 1980 992.6 994.9 986.6 991.5 989.2 987.2 998.9 988.5 993.2 977.9 994.5 991.4 1981 989.7 987.3 992.6 994.0 986.5 989.8 995.2 996.1 990.3 982.8 981.2 983.4 1982 993.1 988.1 977.7 980.8 990.6 986.0 992.1 977.8 976.7 983.6 984.4 996.9 1983 995.1 993.5 981.7 982.3 985.9 990.3 984.0 983.5 983.4 973.1 979.6 985.8 1984 999.0 988.9 983.2 983.1 993.2 984.6 983.7 991.7 984.0 977.6 982.6 997.1 1985 995.7 988.0 986.9 987.9 988.9 988.5 976.7 988.9 978.9 979.0 976.0 982.6 1986 990.8 1000.1 990.8 983.1 990.4 988.7 986.3 989.3 980.3 981.1 980.7 986.3 1987 997.7 990.9 984.5 988.7 983.2 989.3 991.8 974.6 991.2 982.0 982.4 990.5 1988 992.5 984.8 984.7 983.5 991.0 996.5 981.3 979.4 985.9 993.2 984.3 985.4 1989 988.8 985.6 982.1 990.3 975.7 982.4 984.2 989.0 988.6 979.7 979.5 991.9 1990 991.3 981.8 984.5 994.5 995.2 992.1 997.8 986.3 976.5 985.4 987.3 987.7 1991 984.0 988.2 -999 -999 -999 -999 -999 -999 -999 -999 -999 -999