Harry 18Z pressure 1987 990.6 987.3 986.0 986.9 981.3 984.9 989.6 974.1 987.6 976.2 977.5 983.7 1988 986.8 984.0 984.5 981.3 987.9 993.0 974.2 972.0 981.8 987.3 980.4 981.0 1989 982.8 985.5 982.5 986.1 968.5 979.2 - - - - - - 1990 - - - - - - - - - - - - 1991 - 987.0 978.9 981.7 984.7 986.6 988.9 979.0 975.6 974.9 981.2 992.6 1992 987.3 993.4 984.0 982.2 987.0 991.5 978.1 982.0 - - 975.9 980.9 1993 994.4 975.8 983.5 977.7 980.8 974.1 968.7 974.4 - - 977.7 982.6 1994 982.9 981.7 977.5 982.1 983.0 995.5 985.1 - - - - - 1995 - - 876.0 867.4 865.5 877.5 882.8 870.3 864.0 865.2 868.3 - 1996 - - 868.4 870.2 - 867.5 - 984.2 984.6 - - - 1997 987.0 987.4 977.8 983.0 968.7 983.6 975.5 972.9 976.9 974.5 984.9 989.3 1998 985.3 979.2 979.1 972.5 979.8 973.5 976.6 975.1 985.3 976.9 970.4 981.4 1999 - 874.8 869.9 863.8 862.4 881.6 867.8 865.7 870.8 854.4 865.7 865.2 2000 869.3 871.5 874.5 870.2 870.1 872.1 867.2 869.6 873.4 863.8 873.7 883.8 2001 879.2 877.8 869.2 867.9 869.3 870.5 873.4 861.4 862.6 859.3 867.6 869.2 2002 874.0 867.0 877.4 866.6 879.7 875.6 869.9 862.0 875.1 879.1 874.1 870.4 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -