GF08 pressure 1986 - - - - - - - - - - 740.1 - 1987 754.8 746.5 - - 737.6 - - 727.0 734.9 734.7 - - 1988 - 743.2 - - - - - - - - 741.4 744.6 1989 - 742.2 - - 729.7 737.7 - 743.0 739.2 739.0 742.5 753.7 1990 750.7 743.5 - 749.4 749.2 743.9 744.3 735.5 - 740.2 743.9 - 1991 745.0 748.8 741.1 - 740.1 745.0 748.8 736.1 - 733.0 - 753.4 1992 749.5 752.1 744.1 - 744.3 746.6 736.2 - 728.2 737.2 740.8 744.2 1993 753.2 741.8 741.3 - 731.1 - - - - - - - 1994 - - - - - - - - - - - - 1995 - 743.2 742.0 739.2 735.2 742.6 755.9 736.7 727.8 735.7 744.1 743.6 1996 - 747.7 738.7 740.3 737.0 743.0 741.8 740.6 744.8 734.5 747.4 - 1997 746.7 - - - - - - - - - - - 1998 - - - - - - - - - - - - 1999 - - - - - - - - - - - - 2000 - 749.2 - - 740.2 748.9 745.9 - 748.5 - - - 2001 - - - 743.6 - - - - - - - 753.5 2002 - 747.2 755.8 748.0 - 751.0 - - - 752.6 - - 2003 - - - - - 756.6 743.1 - - - - - 2004 - - - - - - - - - - - - 2005 - 748.7 - 742.5 - 753.7 744.4 740.6 - 742.7 749.5 764.3 2006 754.8 752.6 747.5 751.6 - - 739.0 752.2 745.4 - - 751.5 2007 757.7 - 751.7 751.2 - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -