Year	mm Hg
1980	126.3
1981	126.5
1982	126.7
1983	127.1
1984	127.3
1985	127.6
1986	127.8
1987	128.1
1988	128.5
1989	128.8
1990	129.2
1991	129.5
1992	129.8
1993	130.1
1994	130.4
1995	130.7
1996	130.9
1997	131.2
1998	131.5
1999	131.7
2000	132
2001	132.4
2002	132.7
2003	133.1
2004	133.4
2005	133.7
2006	134
2007	134.2
2008	134.5