Great_Wall msl_pressure 1987 - - - - - - - - - - 982.5 - 1988 - - - - 998.6 - - - - - 984.1 984.2 1989 - 988.7 988.9 993.1 - 985.3 - 999.8 991.9 984.2 984.8 991.7 1990 990.8 991.9 985.7 991.1 1003.7 985.5 993.2 980.3 993.3 977.7 973.7 - 1991 - 992.0 990.0 992.6 - - - - - - - - 1992 - - - - - - - - - - - - 1993 - - - - - - - - - 985.7 985.7 985.2 1994 985.7 986.9 993.8 996.1 996.7 997.4 996.1 - 982.6 990.5 994.8 - 1995 - 993.1 985.1 - 993.4 990.4 991.3 995.5 988.7 - 983.2 - 1996 991.4 991.2 986.7 996.4 986.7 992.9 991.2 990.6 996.7 985.5 978.5 989.0 1997 - - 990.4 986.0 998.9 1002.3 - 985.2 994.0 991.4 - - 1998 985.5 994.9 990.5 995.5 1000.4 996.4 979.0 986.4 990.9 981.8 984.6 982.5 1999 990.2 985.0 995.9 988.3 - - - - - - - - 2000 982.3 996.4 1003.5 990.1 999.0 997.9 1005.1 992.5 1002.2 990.3 995.3 989.7 2001 989.7 988.5 - 988.1 999.8 992.2 - 982.3 991.4 985.0 - - 2002 - 987.0 992.3 - 993.8 991.4 994.8 999.5 1002.9 989.8 990.1 990.4 2003 994.5 987.3 997.6 994.6 991.7 997.8 984.9 - - 985.2 984.7 995.4 2004 986.4 998.9 - - 994.6 989.5 991.5 991.7 980.5 - - 991.4 2005 987.3 987.8 991.8 985.1 995.6 997.2 998.6 993.3 999.8 994.7 991.3 995.5 2006 - - 975.7 991.1 - - - 1000.9 992.1 - 983.6 - 2007 990.9 987.9 989.7 990.7 - - - 988.7 998.8 986.2 991.6 985.4 2008 - 990.4 991.9 988.7 994.5 994.8 997.4 993.5 1002.6 - 985.0 983.1 2009 986.1 - - - - - - - - - - -