Year	mm Hg
1980	126.4
1981	126.3
1982	126.2
1983	126.1
1984	126.1
1985	126
1986	126
1987	126
1988	126.1
1989	126.2
1990	126.4
1991	126.6
1992	126.7
1993	126.9
1994	127.1
1995	127.2
1996	127.3
1997	127.5
1998	127.7
1999	127.9
2000	128.2
2001	128.5
2002	128.8
2003	129.2
2004	129.7
2005	130.2
2006	130.6
2007	131.1
2008	131.6