Year	mm Hg
1980	126.3
1981	126.3
1982	126.5
1983	126.6
1984	126.7
1985	126.9
1986	127
1987	127.2
1988	127.4
1989	127.5
1990	127.7
1991	127.9
1992	128
1993	128.2
1994	128.3
1995	128.5
1996	128.6
1997	128.8
1998	129
1999	129.2
2000	129.3
2001	129.5
2002	129.7
2003	129.9
2004	130.1
2005	130.2
2006	130.3
2007	130.5
2008	130.6