Year	mm Hg
1980	130.1
1981	129.9
1982	129.7
1983	129.5
1984	129.3
1985	129.1
1986	128.9
1987	128.7
1988	128.5
1989	128.3
1990	128.2
1991	128
1992	127.9
1993	127.8
1994	127.7
1995	127.6
1996	127.4
1997	127.3
1998	127.1
1999	126.9
2000	126.8
2001	126.6
2002	126.5
2003	126.3
2004	126.2
2005	126.1
2006	125.9
2007	125.7
2008	125.5