GEO3 18Z pressure 1982 - 751.7 746.5 745.0 746.6 745.3 747.0 740.7 737.5 747.3 756.3 763.7 1983 759.3 756.8 750.8 747.2 751.2 748.5 743.4 - 743.8 742.4 746.4 752.0 1984 759.5 754.8 749.1 747.7 - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - 736.9 741.2 750.4 752.6 1987 - - - - - - - - - - - 761.8 1988 - 754.1 754.0 - 762.7 769.4 757.8 753.9 758.7 760.0 750.7 - 1989 763.0 - - 754.9 748.1 756.6 759.8 774.6 772.2 773.0 781.4 784.2 1990 786.4 779.4 779.2 - 782.6 778.4 786.3 768.1 762.9 776.1 779.2 781.4 1991 779.2 785.4 775.8 - 776.1 780.3 779.6 770.2 774.0 768.1 779.7 790.4 1992 784.6 785.9 779.7 - 783.5 783.7 772.6 770.0 766.9 772.5 773.1 780.9 1993 788.7 770.6 771.8 768.4 - 764.5 761.3 760.1 - - - 777.5 1994 778.7 775.1 771.6 776.3 776.2 783.3 775.9 767.7 771.2 770.1 779.5 775.5 1995 777.2 778.9 776.0 775.9 770.2 774.1 780.9 770.5 759.7 773.0 777.6 777.1 1996 - 781.8 773.0 773.5 771.0 775.9 776.3 772.8 781.7 769.4 780.8 781.8 1997 781.4 777.3 770.0 778.1 769.1 779.1 764.5 767.9 767.1 770.8 782.5 783.6 1998 779.1 776.7 774.2 762.1 772.3 772.0 769.8 765.0 773.4 771.5 770.9 775.6 1999 781.1 779.7 776.2 770.2 770.4 783.3 769.5 769.1 771.2 762.7 774.3 773.4 2000 775.3 775.5 773.6 776.4 769.3 776.4 772.4 772.0 775.6 766.6 780.6 786.3 2001 780.5 782.4 776.2 768.7 776.1 774.4 775.2 - 766.7 768.9 773.2 774.2 2002 779.2 - 781.3 775.4 783.9 775.4 776.7 766.9 773.8 780.4 776.6 776.3 2003 - - - - 775.0 781.1 773.6 - - - - 787.6 2004 - 785.0 - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - 782.9 772.9 771.8 773.7 778.2 775.7 2008 779.4 775.1 777.0 779.1 777.0 771.0 773.6 768.3 770.6 765.5 773.0 - 2009 - - - - - - - - - - - -