Byrd pressure 1980 - - 813.2 818.8 817.2 803.0 817.5 811.3 811.0 800.8 816.0 816.7 1981 - 816.8 818.0 813.7 808.4 802.4 805.9 806.0 806.0 806.0 804.3 809.8 1982 821.4 814.0 804.1 798.9 804.8 804.0 808.0 801.5 797.1 801.7 812.3 824.4 1983 820.9 816.7 812.1 808.0 813.1 805.0 799.5 795.4 803.5 794.4 803.0 813.0 1984 821.7 816.8 809.0 808.2 810.4 810.2 793.6 799.3 798.6 807.7 806.9 821.4 1985 820.4 813.3 811.0 808.4 - 806.3 790.5 799.3 796.5 800.1 802.4 810.0 1986 816.7 819.8 814.4 806.7 819.6 812.7 801.2 799.6 793.9 798.3 806.0 812.3 1987 821.4 816.0 804.6 809.9 809.7 811.1 815.5 801.4 808.1 801.3 803.4 816.5 1988 817.5 811.9 - - - - - - - - - - 1989 - - - - - - - - - - - - 1990 - 810.1 810.0 815.8 819.5 802.8 812.1 798.5 794.9 - - - 1991 - 818.2 805.1 808.6 812.9 812.2 811.2 800.0 804.0 804.4 810.3 825.2 1992 818.6 821.5 817.0 808.6 818.8 - - - - - - - 1993 - 810.1 810.1 806.5 - 807.9 801.9 801.1 796.9 800.9 808.1 812.7 1994 - 809.9 804.5 812.7 809.6 818.6 812.1 793.7 805.9 806.0 814.8 815.6 1995 812.8 812.0 813.9 805.8 803.8 817.7 819.7 808.4 801.5 803.2 806.5 809.8 1996 817.2 816.2 807.6 - - - - - - - - - 1997 - 819.7 806.5 807.2 800.0 815.0 803.5 798.1 805.4 809.4 819.1 823.2 1998 815.5 813.4 808.5 799.2 811.3 806.9 801.1 800.0 807.3 804.8 801.1 812.5 1999 814.8 813.3 808.8 803.4 799.0 - - - - - - 805.6 2000 - - - - - 811.0 805.7 809.2 - - - - 2001 - - - - - - - - - - - - 2002 814.3 806.6 818.8 - - - - - - - - 811.0 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - 814.2 809.5 811.0 820.3 804.0 - - 814.0 807.2 2008 815.3 811.4 814.3 810.0 807.1 - - - - 803.4 - - 2009 - - - - - - - - - - - -