Year	mm Hg
1980	127.3
1981	127.2
1982	127.2
1983	127
1984	126.9
1985	126.7
1986	126.6
1987	126.4
1988	126.2
1989	125.9
1990	125.6
1991	125.2
1992	124.9
1993	124.7
1994	124.6
1995	124.4
1996	124.3
1997	124.3
1998	124.3
1999	124.4
2000	124.5
2001	124.6
2002	124.7
2003	124.8
2004	124.9
2005	124.9
2006	125
2007	125.1
2008	125.2