Year	mm Hg
1980	126.4
1981	126.6
1982	126.8
1983	126.9
1984	127
1985	127.1
1986	127.3
1987	127.4
1988	127.6
1989	127.8
1990	128
1991	128.2
1992	128.3
1993	128.5
1994	128.7
1995	128.8
1996	128.9
1997	129
1998	129.1
1999	129.2
2000	129.3
2001	129.5
2002	129.6
2003	129.7
2004	129.8
2005	130
2006	130
2007	130.1
2008	130.2