Year	mm Hg
1980	130.4
1981	130.2
1982	129.9
1983	129.6
1984	129.3
1985	129
1986	128.8
1987	128.6
1988	128.5
1989	128.4
1990	128.4
1991	128.3
1992	128.2
1993	128
1994	127.9
1995	127.7
1996	127.6
1997	127.3
1998	127
1999	126.8
2000	126.6
2001	126.3
2002	126.1
2003	125.9
2004	125.7
2005	125.4
2006	125.2
2007	125
2008	124.8