Year	mm Hg
1980	125.1
1981	125
1982	124.8
1983	124.7
1984	124.6
1985	124.5
1986	124.4
1987	124.4
1988	124.4
1989	124.3
1990	124.2
1991	124.2
1992	124.2
1993	124.2
1994	124.2
1995	124.3
1996	124.4
1997	124.5
1998	124.7
1999	124.9
2000	125.1
2001	125.4
2002	125.6
2003	125.9
2004	126.2
2005	126.4
2006	126.6
2007	126.9
2008	127