Marsh 00Z msl_pressure 1987 - - - - - - - - - - - - 1988 - - - - - - - - - - - - 1989 - - - - - - 996.2 - - - 984.6 991.9 1990 - 992.4 - 991.3 - - - - - 977.0 - 988.4 1991 - - 990.6 992.2 - - - - - - - - 1992 - - - - - - - - - - - - 1993 - - - - - - - - - 985.6 986.5 985.1 1994 987.0 - - 996.3 - - 996.0 989.0 - 989.0 994.2 - 1995 - 992.4 - 991.3 - 990.3 - - - 995.5 983.4 - 1996 - 992.2 - 995.7 - - - 991.1 996.3 - - - 1997 987.7 994.7 991.6 986.3 - - 992.7 986.8 994.1 991.5 - - 1998 - 996.8 991.4 996.0 1001.6 997.2 978.8 986.3 991.2 982.3 985.3 982.4 1999 991.0 984.9 994.7 989.7 991.5 996.9 991.6 989.7 992.1 988.2 988.6 983.8 2000 982.9 995.8 1002.2 988.7 - 999.5 1006.0 992.6 1002.2 988.0 995.2 989.2 2001 989.9 987.9 987.8 988.5 999.8 992.1 996.3 982.5 991.6 986.1 - - 2002 988.6 987.0 992.5 988.5 993.5 991.0 995.2 1000.1 1003.1 989.7 990.3 989.8 2003 993.2 987.6 997.2 995.4 992.0 996.7 984.7 - - 984.3 985.1 995.2 2004 986.5 998.2 - - 995.3 989.8 991.4 990.7 981.0 - - 991.5 2005 986.4 988.0 992.1 984.9 995.0 995.8 998.2 991.8 999.7 995.7 991.4 995.1 2006 - - 981.7 992.9 989.7 - - 1000.7 991.5 990.3 982.5 - 2007 990.4 987.3 991.0 989.4 - - 995.8 - 997.9 984.2 991.1 985.3 2008 988.6 - - 988.4 993.4 993.7 996.2 991.7 1002.4 - 984.2 981.7 2009 985.6 - - - - - - - - - - -