1980 -999 -999 -999 980.4 986.9 980.7 990.7 982.4 987.7 966.6 991.5 988.8 1981 987.6 990.0 982.7 991.3 981.7 973.6 978.4 988.6 986.9 977.8 973.0 977.3 1982 992.0 984.8 977.1 976.2 981.1 976.9 983.9 975.8 968.7 977.0 983.5 997.2 1983 993.2 989.5 980.7 971.4 980.1 985.3 973.0 969.5 978.2 964.8 972.8 981.3 1984 993.3 988.4 977.0 980.5 983.4 980.9 971.9 976.4 975.0 983.7 976.3 990.4 1985 989.4 986.4 978.9 978.4 984.1 981.0 972.2 973.3 970.7 971.5 971.6 977.6 1986 985.0 987.6 986.0 978.7 997.0 993.8 979.0 979.5 975.8 968.2 979.7 981.0 1987 990.6 987.8 980.0 981.7 978.8 985.4 990.5 975.8 986.2 971.7 975.7 984.1 1988 988.6 983.0 983.4 971.5 985.0 988.5 976.5 979.5 978.8 983.4 978.0 984.7 1989 984.1 981.3 977.6 985.6 965.3 972.9 971.3 978.6 974.4 971.9 973.5 989.2 1990 989.1 976.8 -999 -999 -999 -999 -999 -999 -999 -999 -999 -999