Year	mm Hg
1980	124.7
1981	125.1
1982	125.5
1983	125.9
1984	126.2
1985	126.5
1986	126.7
1987	126.9
1988	127
1989	127.1
1990	127.1
1991	127.2
1992	127.2
1993	127.3
1994	127.3
1995	127.3
1996	127.3
1997	127.2
1998	127.2
1999	127.2
2000	127.2
2001	127.2
2002	127.1
2003	127.1
2004	127
2005	126.9
2006	126.8
2007	126.7
2008	126.5