Year	mm Hg
1980	133.3
1981	132.8
1982	132.3
1983	131.8
1984	131.3
1985	130.7
1986	130.2
1987	129.7
1988	129.3
1989	128.8
1990	128.4
1991	127.9
1992	127.5
1993	127.1
1994	126.7
1995	126.2
1996	125.8
1997	125.4
1998	125
1999	124.6
2000	124.2
2001	123.9
2002	123.5
2003	123.2
2004	123
2005	122.7
2006	122.4
2007	122.1
2008	121.8