Year	mm Hg
1980	130.4
1981	130.1
1982	129.8
1983	129.5
1984	129.2
1985	128.9
1986	128.6
1987	128.5
1988	128.3
1989	128.1
1990	127.9
1991	127.7
1992	127.5
1993	127.2
1994	126.9
1995	126.5
1996	126.2
1997	125.9
1998	125.4
1999	125
2000	124.5
2001	124.1
2002	123.6
2003	123.2
2004	122.7
2005	122.3
2006	121.9
2007	121.5
2008	121.1