Year	mm Hg
1980	126.5
1981	126.2
1982	125.9
1983	125.6
1984	125.2
1985	124.9
1986	124.6
1987	124.4
1988	124.1
1989	123.8
1990	123.5
1991	123.1
1992	122.8
1993	122.5
1994	122.2
1995	122
1996	121.8
1997	121.6
1998	121.5
1999	121.3
2000	121.2
2001	121
2002	120.8
2003	120.6
2004	120.4
2005	120.2
2006	120
2007	119.8
2008	119.6