Year	mm Hg
1980	127.1
1981	127.1
1982	127.2
1983	127.3
1984	127.3
1985	127.4
1986	127.5
1987	127.6
1988	127.8
1989	127.9
1990	128
1991	128.1
1992	128.1
1993	128.1
1994	127.9
1995	127.8
1996	127.6
1997	127.5
1998	127.2
1999	126.9
2000	126.7
2001	126.4
2002	126.1
2003	125.7
2004	125.4
2005	125.1
2006	124.8
2007	124.4
2008	124.1