Year	mm Hg
1980	122.5
1981	122.3
1982	122.1
1983	121.9
1984	121.8
1985	121.7
1986	121.6
1987	121.6
1988	121.7
1989	121.8
1990	121.9
1991	122.1
1992	122.4
1993	122.6
1994	122.9
1995	123.2
1996	123.5
1997	123.8
1998	124.1
1999	124.3
2000	124.5
2001	124.7
2002	124.9
2003	125.1
2004	125.2
2005	125.4
2006	125.6
2007	125.8
2008	126