Year	mm Hg
1980	126.6
1981	126.8
1982	126.9
1983	127.1
1984	127.3
1985	127.4
1986	127.6
1987	127.9
1988	128.1
1989	128.3
1990	128.6
1991	128.8
1992	128.9
1993	129.1
1994	129.2
1995	129.3
1996	129.4
1997	129.5
1998	129.6
1999	129.7
2000	129.9
2001	130.1
2002	130.3
2003	130.6
2004	130.9
2005	131.2
2006	131.5
2007	131.8
2008	132.1