Year	mm Hg
1980	124.8
1981	125.1
1982	125.3
1983	125.6
1984	125.9
1985	126.2
1986	126.5
1987	126.7
1988	126.9
1989	127.2
1990	127.5
1991	127.7
1992	128
1993	128.2
1994	128.5
1995	128.8
1996	129
1997	129.3
1998	129.5
1999	129.8
2000	130.1
2001	130.4
2002	130.6
2003	130.9
2004	131.2
2005	131.5
2006	131.7
2007	131.9
2008	132.1