Year	mm Hg
1980	124.9
1981	125.2
1982	125.5
1983	125.7
1984	125.9
1985	126.1
1986	126.3
1987	126.5
1988	126.8
1989	127.1
1990	127.3
1991	127.5
1992	127.7
1993	127.8
1994	128
1995	128.1
1996	128.3
1997	128.5
1998	128.6
1999	128.8
2000	129
2001	129.3
2002	129.5
2003	129.8
2004	130
2005	130.3
2006	130.6
2007	130.9
2008	131.1