D_10 18Z pressure 1980 - 957.0 952.1 956.8 954.1 952.0 966.3 952.9 951.8 944.0 957.6 954.9 1981 - 951.2 959.1 957.4 - - - - - - - - 1982 - - 945.3 945.9 953.3 956.8 962.9 943.1 939.4 - - - 1983 959.4 955.5 949.7 951.7 956.0 958.4 947.6 953.2 948.9 941.8 949.5 - 1984 - 954.3 951.9 952.7 960.2 951.5 952.6 959.7 946.3 945.2 949.9 964.6 1985 - 951.7 954.4 956.4 - 957.8 942.7 952.9 944.5 946.8 945.7 951.8 1986 955.8 965.7 954.1 - 956.3 950.5 950.1 954.5 - - - 952.6 1987 961.0 952.3 949.5 953.7 947.7 959.6 957.1 938.9 949.0 - - 955.2 1988 956.6 950.3 949.9 951.4 958.1 961.0 945.2 949.5 952.4 956.2 950.9 948.7 1989 956.7 951.3 948.3 953.7 942.4 949.5 951.4 956.4 952.5 950.1 946.4 958.1 1990 955.7 949.1 951.6 961.8 958.5 957.0 956.3 953.3 941.2 - - - 1991 - - - - - - - - - - - - 1992 - 959.1 951.5 950.9 954.4 961.4 949.5 952.1 943.2 949.2 948.3 952.7 1993 958.5 952.4 - - - - - - - 942.4 945.0 950.8 1994 952.0 951.1 948.1 950.6 954.5 - - - - 948.6 951.6 948.3 1995 951.2 950.2 951.6 947.4 945.5 - - - - - - - 1996 - - - - - - - - - - - - 1997 - - - - - - - - - - - - 1998 - 946.6 946.7 942.2 953.6 949.3 - - 945.1 - - - 1999 952.5 952.4 952.7 942.1 945.5 - - - 950.1 941.7 946.6 944.7 2000 948.4 951.1 951.2 950.8 943.9 953.6 - - - - - 959.7 2001 954.0 953.1 955.2 950.5 959.4 950.4 - - - 944.8 950.1 950.1 2002 956.3 947.8 956.1 951.5 961.4 956.7 - - 947.8 956.0 952.2 948.7 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -