Year	mm Hg
1980	126.9
1981	126.9
1982	127
1983	127.1
1984	127.2
1985	127.3
1986	127.4
1987	127.5
1988	127.7
1989	127.9
1990	128.1
1991	128.2
1992	128.4
1993	128.6
1994	128.7
1995	128.8
1996	128.9
1997	129
1998	129.2
1999	129.3
2000	129.5
2001	129.6
2002	129.8
2003	130.1
2004	130.3
2005	130.6
2006	130.9
2007	131.2
2008	131.5