Year	mm Hg
1980	133.6
1981	133.4
1982	133.2
1983	132.9
1984	132.6
1985	132.4
1986	132.1
1987	131.8
1988	131.5
1989	131.1
1990	130.7
1991	130.3
1992	129.9
1993	129.4
1994	128.9
1995	128.4
1996	128
1997	127.5
1998	127.1
1999	126.7
2000	126.4
2001	126.1
2002	125.9
2003	125.6
2004	125.4
2005	125.2
2006	125.1
2007	125
2008	124.9