Marilyn pressure 1987 - 987.7 985.8 987.8 984.0 - - - - - - 984.3 1988 987.4 983.3 986.1 984.0 990.9 - 976.4 - - - - - 1989 - 985.3 984.8 - - 981.6 981.0 983.5 - - - - 1990 - 981.0 985.0 - - 987.7 - - 970.5 981.2 981.9 983.4 1991 980.3 986.6 979.7 984.1 985.8 988.3 990.0 980.7 979.7 975.9 981.0 993.1 1992 985.9 993.3 986.0 982.5 988.4 992.8 980.6 982.2 972.3 977.2 975.8 980.5 1993 992.7 977.3 984.2 980.3 - - 970.6 975.9 974.9 974.3 977.7 980.7 1994 982.9 981.0 976.9 983.6 983.4 997.5 987.5 973.3 986.6 976.9 982.7 978.8 1995 978.8 979.8 989.4 981.5 980.3 - - - - - 977.3 976.3 1996 984.5 988.3 982.8 976.9 983.5 981.1 980.7 986.9 987.2 970.6 985.1 983.8 1997 986.4 988.0 977.3 982.8 972.2 985.8 977.5 975.8 979.9 976.6 987.7 988.7 1998 983.2 979.8 980.4 973.2 981.0 975.7 978.5 977.5 986.3 978.9 972.5 979.7 1999 981.5 985.7 982.9 979.7 976.8 997.6 978.5 981.6 981.5 963.7 971.1 972.7 2000 976.9 981.1 982.3 982.8 981.8 984.1 980.9 - - - - - 2001 - 985.9 982.4 977.5 983.2 981.8 985.8 980.4 977.2 971.4 974.8 975.3 2002 981.1 975.9 988.7 979.5 991.2 992.2 986.5 976.8 984.5 987.9 981.5 977.1 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -