Year	mm Hg
1980	125.9
1981	126
1982	126.1
1983	126.3
1984	126.3
1985	126.4
1986	126.5
1987	126.4
1988	126.2
1989	126.1
1990	125.9
1991	125.7
1992	125.6
1993	125.4
1994	125.3
1995	125.3
1996	125.3
1997	125.3
1998	125.4
1999	125.5
2000	125.6
2001	125.8
2002	126
2003	126.2
2004	126.4
2005	126.6
2006	126.9
2007	127.1
2008	127.3