Year	mm Hg
1980	132.6
1981	132.2
1982	131.8
1983	131.4
1984	131
1985	130.7
1986	130.3
1987	130.1
1988	129.9
1989	129.7
1990	129.5
1991	129.3
1992	129.1
1993	128.9
1994	128.7
1995	128.5
1996	128.3
1997	128.1
1998	128
1999	127.8
2000	127.6
2001	127.5
2002	127.3
2003	127.2
2004	127.1
2005	127
2006	126.9
2007	126.8
2008	126.7