GF08 18Z pressure 1986 - - - - - - - - - - 740.4 - 1987 754.9 746.0 - 741.1 737.4 742.1 - 727.1 734.6 735.0 740.0 748.1 1988 - 743.0 744.8 - 749.0 751.5 - - - 746.0 741.6 744.5 1989 751.0 742.2 740.6 741.0 729.9 737.4 732.7 742.9 738.7 738.4 743.3 753.7 1990 750.1 743.7 743.1 750.1 749.7 744.0 743.0 735.5 730.3 740.1 744.1 749.5 1991 744.6 748.3 740.9 742.0 740.1 744.4 749.1 736.1 - 732.9 745.5 753.2 1992 749.6 751.9 744.2 737.4 744.0 747.0 736.0 736.0 - 737.3 740.2 744.7 1993 752.9 742.3 741.2 738.4 730.9 735.4 728.6 727.2 731.8 731.7 738.3 742.9 1994 747.5 742.7 737.1 739.3 741.1 751.9 739.5 731.7 738.4 734.9 745.0 741.0 1995 744.1 742.7 742.4 739.2 735.0 742.7 755.5 737.0 727.9 736.2 744.3 743.2 1996 749.0 747.5 738.8 739.8 736.9 743.1 741.8 741.0 744.4 734.7 747.6 748.1 1997 746.6 - - - - - - - - - - - 1998 - - - - - - - - - - - - 1999 - - - - - - - - - - - - 2000 - 749.0 748.7 752.7 740.8 748.3 745.9 745.2 748.4 - - - 2001 - - - 743.5 - - - - - - - 753.1 2002 751.2 746.9 755.9 748.3 - 750.7 - - - 752.8 - - 2003 - - - - 747.2 756.6 742.8 - - - - - 2004 - - - - - 742.6 738.0 743.8 737.7 - - 757.8 2005 756.1 748.6 751.6 742.1 746.8 753.6 744.3 740.4 741.7 742.6 749.2 764.0 2006 754.9 752.5 747.5 752.0 738.9 745.0 738.9 751.6 745.3 741.2 750.4 751.5 2007 757.5 750.6 751.7 750.9 - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -