Drescher 00Z pressure 1994 984.7 - - - - - - - - - - 979.1 1995 984.0 979.5 981.0 984.2 979.7 985.4 992.9 982.7 979.9 983.2 979.2 977.5 1996 985.7 985.6 978.5 982.2 981.6 987.4 977.7 984.4 990.0 975.5 982.7 985.4 1997 988.1 987.9 975.7 985.9 978.6 988.5 980.2 980.7 978.0 981.7 986.8 989.0 1998 984.0 980.0 980.3 975.2 976.3 978.8 977.4 978.1 979.9 980.1 975.3 979.0 1999 984.6 984.3 984.3 976.8 980.9 993.4 982.0 974.4 979.8 970.0 980.0 974.2 2000 977.4 983.7 985.9 984.8 980.9 984.4 989.9 981.0 986.0 979.1 983.6 993.6 2001 - 987.7 - - - - - - - - - - 2002 - - - - - 982.3 - - - - - - 2003 - - - - 978.7 991.4 982.8 - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -