Year	mm Hg
1980	131.9
1981	131.4
1982	130.9
1983	130.3
1984	129.8
1985	129.4
1986	128.9
1987	128.6
1988	128.3
1989	128.1
1990	127.9
1991	127.7
1992	127.5
1993	127.3
1994	127
1995	126.7
1996	126.3
1997	125.9
1998	125.4
1999	125
2000	124.6
2001	124.2
2002	123.8
2003	123.5
2004	123.1
2005	122.7
2006	122.4
2007	122
2008	121.7