Year	mm Hg
1980	126.6
1981	126.4
1982	126.2
1983	126.1
1984	125.9
1985	125.6
1986	125.4
1987	125.2
1988	125.1
1989	125
1990	125
1991	124.9
1992	124.9
1993	124.9
1994	124.9
1995	125
1996	125
1997	125.1
1998	125.2
1999	125.3
2000	125.5
2001	125.6
2002	125.7
2003	125.9
2004	126
2005	126.1
2006	126.2
2007	126.3
2008	126.4