1980    -999    -999    -999   964.8   971.1   964.3   974.6   966.3   971.3   951.0   975.5   973.2
1981   972.0   974.2   967.0   974.9   965.4   957.4   962.1   971.6   970.3   961.8   957.3   961.9
1982   976.5   969.1   961.2   959.6   964.7   960.7   967.5   959.4   952.5   960.8   967.7   981.5
1983   977.5   973.7   964.9   955.7   964.3   968.7   956.5   953.0   961.9   948.9   957.1   965.8
1984   977.7   972.7   961.4   964.5   967.1   964.8   955.1   959.6   958.4   967.6   960.6   974.8
1985   973.8   970.6   963.1   962.4   968.0   964.2   955.4   956.8   954.4   955.4   956.0   962.1
1986   969.4   971.9   970.0   962.5   980.7   977.1   962.4   962.8   959.0   952.2   963.8   965.4
1987   975.1   972.0   963.7   965.5   962.7   969.1   974.2   959.5   969.8   955.7   959.9   968.6
1988   973.1   967.4   967.4   955.8   968.9   972.2   960.4   963.3   962.6   967.3   962.3   969.2
1989   968.7   965.7   961.9   969.7   949.0   956.6   954.9   962.0   957.9   955.9   957.9   973.6
1990   973.7   961.6    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999