Year	mm Hg
1980	126.1
1981	125.8
1982	125.5
1983	125.1
1984	124.8
1985	124.5
1986	124.2
1987	124
1988	123.8
1989	123.5
1990	123.4
1991	123.2
1992	123
1993	122.7
1994	122.5
1995	122.2
1996	122
1997	121.8
1998	121.6
1999	121.5
2000	121.5
2001	121.6
2002	121.6
2003	121.7
2004	121.8
2005	121.9
2006	122
2007	122
2008	122.1