Limbert pressure 1995 - - - - - - - - - - - 979.1 1996 987.5 982.7 984.4 995.8 985.4 993.7 982.9 989.2 996.1 974.0 977.5 985.1 1997 985.3 991.4 980.5 989.4 986.7 998.5 986.9 984.7 990.8 989.8 995.3 993.2 1998 983.7 987.3 987.4 980.6 987.9 989.5 982.4 984.2 - 981.5 - - 1999 - - - 981.8 - - - - - - - - 2000 - - 997.7 986.0 991.4 990.5 995.7 - - 986.5 988.9 990.6 2001 989.6 995.0 991.2 986.9 994.4 990.9 - - - 972.5 975.5 973.1 2002 983.9 978.5 994.3 990.0 998.1 990.8 992.2 984.2 997.7 990.0 988.4 - 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - 983.6 985.1 995.1 994.3 991.3 991.4 984.0 986.1 980.5 984.4 975.9 2008 979.1 979.1 987.6 984.4 983.6 986.7 984.9 974.5 983.9 978.7 975.7 970.6 2009 - - - - - - - - - - - -