Marsh 06Z msl_pressure 1987 - - - - - - - - - - - - 1988 - - - - - - - - - - - - 1989 - - - - - - - - - - 984.3 - 1990 - 992.8 - 991.2 - - - - - 977.9 - - 1991 988.2 - 989.8 992.3 - - - - - - - - 1992 - - - - - - - - - - - - 1993 - - - - - - - - - - 986.1 - 1994 984.8 - - 995.6 - - - 989.4 - 988.3 995.4 - 1995 - - - 992.0 - 990.3 988.9 - - - 982.1 - 1996 - 991.2 - - - - 991.5 - 995.9 - - - 1997 - 994.0 990.7 986.3 - - - - 993.9 992.3 - - 1998 - - 990.1 997.3 1001.8 997.1 978.9 986.8 990.2 982.1 985.5 982.8 1999 990.8 984.6 995.6 989.2 992.5 996.6 990.6 990.1 991.6 986.1 988.8 984.2 2000 981.8 996.0 1001.5 989.1 - 1000.3 1006.7 992.9 - 987.7 994.6 989.6 2001 990.0 988.6 - 987.6 999.4 992.4 996.2 983.4 991.6 985.3 - 983.4 2002 988.4 987.1 991.7 988.1 993.7 990.8 994.0 999.3 1002.8 989.6 989.4 989.8 2003 992.6 987.2 997.6 995.2 991.4 996.6 985.6 - - 984.0 984.6 998.2 2004 986.6 998.7 - - 991.7 988.8 991.9 991.7 980.1 - - 991.5 2005 986.9 987.4 991.1 985.4 994.7 997.1 997.8 992.9 - 994.3 990.4 995.5 2006 - - 980.9 992.0 - - - 1000.5 991.4 - 982.9 985.3 2007 990.4 - 989.0 - - - - 987.3 998.7 984.7 990.2 984.3 2008 986.7 989.9 - 987.8 993.4 993.4 995.9 993.3 1001.6 - 983.8 981.5 2009 985.5 - - - - - - - - - - -