GC41 18Z pressure 1984 - - - - - - - - - - 690.0 703.3 1985 702.2 689.3 690.8 691.0 - - - - 678.9 682.5 680.5 - 1986 694.7 706.1 692.0 686.6 693.7 684.9 683.4 685.1 679.1 684.1 687.5 - 1987 702.8 693.5 687.7 688.8 684.9 - - 672.3 - 683.0 687.5 - 1988 698.5 690.1 690.7 687.3 696.4 697.2 680.7 - - 694.6 687.6 691.9 1989 - 689.6 687.1 687.9 677.0 684.0 682.2 690.6 690.0 687.8 688.9 702.9 1990 697.8 690.8 690.2 697.0 696.0 - 692.6 - - - - - 1991 693.2 697.0 688.6 691.8 686.0 695.0 697.8 685.9 683.4 680.4 694.6 703.1 1992 697.0 699.4 692.9 685.6 689.7 695.7 682.6 685.4 676.2 684.1 687.9 692.3 1993 702.6 691.9 689.3 686.6 678.6 683.6 675.8 675.0 679.4 679.7 686.7 690.4 1994 696.6 691.4 685.0 686.6 686.6 702.2 689.4 678.7 688.5 683.2 692.5 689.0 1995 691.6 691.2 691.7 685.7 682.1 691.9 706.5 687.3 677.9 683.0 693.6 691.3 1996 - 696.2 689.0 688.1 684.4 689.6 691.5 693.2 692.6 683.3 696.5 - 1997 696.8 693.2 686.5 688.9 683.4 694.9 679.9 682.5 682.2 682.5 698.6 699.5 1998 693.5 692.1 685.0 678.6 685.6 685.2 684.1 685.2 683.0 683.4 689.8 691.4 1999 693.8 694.2 689.6 678.7 680.5 698.7 685.4 683.8 684.2 677.7 687.7 - 2000 691.1 690.8 688.8 691.6 682.4 689.3 688.0 689.2 690.4 678.0 698.9 699.7 2001 697.3 697.0 691.7 686.0 691.2 687.4 - - 682.0 - 688.8 694.1 2002 695.0 687.3 696.7 689.7 699.2 693.6 691.1 681.5 687.2 692.5 690.8 690.2 2003 701.1 700.8 691.1 685.1 686.4 695.3 685.1 681.2 686.2 685.9 689.3 703.5 2004 697.0 698.2 685.4 685.6 689.5 685.5 679.9 686.5 679.9 685.4 693.1 701.2 2005 698.0 689.3 691.0 683.3 687.7 696.2 684.4 681.9 683.7 684.2 692.0 706.6 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - - 2010 - - - - - - - - - - - - 2011 - - - - - - - - - - - - 2012 - - - - - - - - - - - - 2013 - - - - - - - - - - - - 2014 - - - - - - - - - - - - 2015 - - - - - - - - - - - - 2016 - - - - - - - - - - - - 2017 - - - - - - - - - - - - 2018 - - - - - - - - - - - - 2019 - - - - - - - - - - - - 2020 - - - - - - - - - - - - 2021 - - - - - - - - - - - - 2022 - - - - - - - - - - - - 2023 - - - - - - - - - - - - 2024 - - - - - - - - - - - -