Year	mm Hg
1980	127
1981	127.2
1982	127.4
1983	127.6
1984	127.6
1985	127.9
1986	128.1
1987	128.4
1988	128.7
1989	128.9
1990	129.2
1991	129.5
1992	129.8
1993	130.1
1994	130.2
1995	130.3
1996	130.5
1997	130.7
1998	130.9
1999	131.1
2000	131.3
2001	131.6
2002	131.9
2003	132.2
2004	132.6
2005	133
2006	133.4
2007	133.8
2008	134.2