Great_Wall station_level_pressure 1985 996.7 984.0 988.7 987.3 994.8 1006.4 985.9 984.5 984.7 993.8 988.1 980.8 1986 984.6 987.9 989.3 988.6 998.0 982.1 984.5 984.0 986.6 992.0 982.7 983.6 1987 988.1 991.6 982.5 987.1 995.0 990.4 991.7 998.6 986.6 987.7 981.2 985.6 1988 991.6 989.4 986.9 991.6 997.0 994.7 990.7 999.6 992.1 1000.4 982.5 982.8 1989 991.1 986.5 987.8 991.4 985.3 983.0 994.6 997.9 990.3 982.8 983.5 990.4 1990 988.8 990.3 984.3 989.7 1002.1 983.3 991.7 979.3 991.9 975.9 972.0 986.8 1991 986.9 990.6 988.7 991.2 987.3 990.4 991.8 986.9 996.5 984.7 987.5 997.3 1992 990.1 986.7 990.1 994.5 998.6 1001.7 996.9 991.0 988.2 986.2 994.2 995.5 1993 995.5 993.1 987.5 987.3 988.4 991.2 992.8 987.6 983.5 984.1 984.4 983.8 1994 983.8 985.1 992.6 994.4 995.7 996.0 994.9 989.0 980.8 989.3 993.3 988.2 1995 992.1 991.7 983.3 991.9 992.0 989.0 989.9 994.0 987.2 992.6 981.6 985.5 1996 989.7 989.4 985.2 994.9 985.3 991.4 989.6 988.8 995.1 983.9 976.7 987.4 1997 986.5 991.6 989.0 984.6 997.3 1000.9 989.4 983.8 992.2 990.0 995.0 997.0 1998 984.0 993.5 988.9 994.2 998.9 994.9 977.5 984.9 989.3 980.3 983.0 981.1 1999 988.6 983.6 994.3 986.7 991.9 996.1 988.9 988.7 990.2 984.6 986.8 982.1 2000 980.9 994.8 1002.0 988.2 997.7 996.3 1003.3 991.2 1000.7 988.8 993.9 988.1 2001 - - - - - - - - - - - - 2002 - - - - - - - - - - - - 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - 989.4 - - - 999.3 990.6 - 982.0 - 2007 989.5 986.7 988.1 989.2 - - - 987.0 997.4 984.7 990.2 983.8 2008 - 988.5 990.2 987.3 993.1 993.1 995.8 991.9 1001.1 - 983.7 981.6 2009 984.4 - - - - - - - - - - -