Year	mm Hg
1980	127.1
1981	127
1982	127
1983	126.8
1984	126.6
1985	126.4
1986	126.3
1987	126.1
1988	126
1989	126
1990	125.9
1991	125.7
1992	125.6
1993	125.4
1994	125.4
1995	125.1
1996	124.9
1997	124.7
1998	124.5
1999	124.3
2000	124.1
2001	123.9
2002	123.8
2003	123.6
2004	123.5
2005	123.4
2006	123.3
2007	123.1
2008	123