Year	mm Hg
1980	131
1981	131
1982	131
1983	130.9
1984	130.9
1985	131
1986	131.1
1987	131.2
1988	131.3
1989	131.5
1990	131.6
1991	131.6
1992	131.6
1993	131.5
1994	131.4
1995	131.1
1996	130.8
1997	130.4
1998	129.9
1999	129.4
2000	128.9
2001	128.4
2002	127.8
2003	127.2
2004	126.6
2005	125.9
2006	125.3
2007	124.7
2008	124.1