GC41 12Z pressure 1984 - - - - - - - - - - 690.8 703.9 1985 702.4 689.6 691.1 - - - - - 679.0 682.7 681.1 - 1986 695.7 705.5 692.4 686.8 693.6 685.2 683.4 685.0 679.3 684.8 687.4 693.5 1987 703.5 693.2 688.2 689.5 685.0 - - 672.4 - 682.9 687.6 - 1988 698.7 690.1 690.8 688.0 696.7 697.6 681.9 - - 696.2 687.7 691.8 1989 - 689.4 687.2 688.3 677.4 683.8 682.4 690.6 689.4 688.3 688.8 702.9 1990 698.1 691.1 690.6 697.0 695.3 - 693.2 - - - - - 1991 693.1 697.2 688.9 692.0 686.5 695.0 698.1 687.2 684.1 680.6 694.8 703.1 1992 697.5 - 692.9 685.4 690.1 695.3 683.2 686.6 675.5 683.6 689.2 692.1 1993 702.4 691.8 689.6 686.8 679.1 683.7 676.5 676.0 679.4 679.7 686.9 689.6 1994 696.8 691.0 685.3 687.4 686.0 702.5 689.5 678.8 688.9 683.4 692.5 689.0 1995 691.5 691.3 691.8 686.3 682.4 693.3 706.7 687.0 678.5 683.9 693.2 691.4 1996 - 696.4 688.8 689.5 684.1 689.2 691.9 693.4 692.8 683.3 696.0 697.7 1997 696.7 693.3 686.7 688.4 683.7 694.1 680.4 682.0 682.2 682.5 698.0 699.7 1998 693.9 692.2 684.1 678.8 685.9 685.5 683.8 684.8 683.2 683.3 689.8 691.4 1999 693.7 694.3 690.0 678.2 680.3 698.6 685.4 684.2 683.3 678.0 687.6 686.3 2000 691.3 691.2 688.9 - 682.1 690.7 688.0 689.7 691.6 677.9 697.0 699.7 2001 697.3 697.1 691.9 686.4 691.9 - - - - - 688.3 694.3 2002 695.3 687.5 696.6 689.6 699.6 693.5 691.6 681.9 687.6 692.6 690.5 690.4 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - 689.4 691.2 683.6 687.8 695.5 683.8 682.0 683.1 683.7 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -