Year	mm Hg
1980	134.5
1981	134.2
1982	133.6
1983	133
1984	132.5
1985	131.9
1986	131.3
1987	130.7
1988	129.9
1989	129.4
1990	128.8
1991	128.2
1992	127.8
1993	127.3
1994	126.8
1995	126.3
1996	125.8
1997	125.3
1998	124.8
1999	124.4
2000	124
2001	123.6
2002	123.3
2003	123
2004	122.7
2005	122.4
2006	122.2
2007	122
2008	121.7