Year	mm Hg
1980	127.8
1981	128
1982	128.2
1983	128.3
1984	128.5
1985	128.6
1986	128.7
1987	129
1988	129.3
1989	129.7
1990	130
1991	130.4
1992	130.6
1993	130.9
1994	131.1
1995	131.3
1996	131.5
1997	131.8
1998	132
1999	132.3
2000	132.6
2001	132.9
2002	133.2
2003	133.6
2004	133.9
2005	134.3
2006	134.7
2007	135.1
2008	135.4