Year	mm Hg
1980	129.2
1981	129.1
1982	129
1983	129
1984	128.9
1985	128.9
1986	128.9
1987	128.9
1988	128.9
1989	129
1990	129
1991	129
1992	129.1
1993	129
1994	128.9
1995	128.9
1996	128.8
1997	128.8
1998	128.8
1999	128.9
2000	129
2001	129.1
2002	129.3
2003	129.5
2004	129.8
2005	130.2
2006	130.6
2007	130.9
2008	131.3