Year	mm Hg
1980	132.4
1981	131.8
1982	131.3
1983	130.7
1984	130.2
1985	129.7
1986	129.2
1987	128.7
1988	128.3
1989	128
1990	127.7
1991	127.4
1992	127.1
1993	126.8
1994	126.5
1995	126.1
1996	125.7
1997	125.3
1998	124.9
1999	124.5
2000	124.1
2001	123.7
2002	123.3
2003	122.9
2004	122.5
2005	122.1
2006	121.7
2007	121.3
2008	120.9