Year	mm Hg
1980	133.8
1981	133.3
1982	132.9
1983	132.5
1984	132
1985	131.5
1986	131.2
1987	130.8
1988	130.6
1989	130.3
1990	130.1
1991	129.9
1992	129.6
1993	129.4
1994	129
1995	128.6
1996	128.2
1997	127.8
1998	127.3
1999	126.9
2000	126.6
2001	126.2
2002	125.9
2003	125.6
2004	125.3
2005	125
2006	124.7
2007	124.4
2008	124.1