Year	mm Hg
1980	127.6
1981	127.4
1982	127.2
1983	127
1984	126.7
1985	126.4
1986	126.1
1987	125.9
1988	125.7
1989	125.4
1990	125.2
1991	124.9
1992	124.7
1993	124.5
1994	124.3
1995	124.1
1996	123.9
1997	123.7
1998	123.6
1999	123.5
2000	123.4
2001	123.4
2002	123.4
2003	123.4
2004	123.5
2005	123.6
2006	123.7
2007	123.9
2008	124