Year	mm Hg
1980	125.2
1981	125
1982	125
1983	125
1984	124.9
1985	125
1986	125
1987	125.3
1988	125.5
1989	125.8
1990	126.1
1991	126.4
1992	126.6
1993	126.7
1994	126.7
1995	126.7
1996	126.7
1997	126.6
1998	126.6
1999	126.5
2000	126.5
2001	126.3
2002	126.1
2003	126
2004	125.7
2005	125.3
2006	124.9
2007	124.5
2008	124.1