Year	mm Hg
1980	126.7
1981	126.8
1982	126.9
1983	127
1984	127.1
1985	127.2
1986	127.4
1987	127.5
1988	127.8
1989	128
1990	128.2
1991	128.5
1992	128.7
1993	128.9
1994	129.1
1995	129.2
1996	129.4
1997	129.6
1998	129.8
1999	130
2000	130.2
2001	130.5
2002	130.8
2003	131.1
2004	131.4
2005	131.7
2006	132.1
2007	132.5
2008	132.8