Year	mm Hg
1980	133.5
1981	132.8
1982	132.1
1983	131.5
1984	130.8
1985	130.2
1986	129.6
1987	129.1
1988	128.6
1989	128.2
1990	127.9
1991	127.5
1992	127.2
1993	126.8
1994	126.4
1995	126
1996	125.6
1997	125.2
1998	124.8
1999	124.5
2000	124.1
2001	123.8
2002	123.5
2003	123.2
2004	123
2005	122.7
2006	122.5
2007	122.3
2008	122