Year	mm Hg
1980	129.7
1981	129.4
1982	129.1
1983	128.8
1984	128.5
1985	128.1
1986	127.8
1987	127.5
1988	127.2
1989	127
1990	126.8
1991	126.6
1992	126.4
1993	126.2
1994	126
1995	125.8
1996	125.5
1997	125.1
1998	124.8
1999	124.4
2000	124
2001	123.6
2002	123.3
2003	122.9
2004	122.5
2005	122.2
2006	121.9
2007	121.5
2008	121.2