Year	mm Hg
1980	125.9
1981	126
1982	126.2
1983	126.4
1984	126.6
1985	126.9
1986	127.2
1987	127.5
1988	127.7
1989	128
1990	128.3
1991	128.5
1992	128.7
1993	128.8
1994	128.9
1995	129
1996	129.1
1997	129.2
1998	129.3
1999	129.3
2000	129.4
2001	129.5
2002	129.6
2003	129.8
2004	129.9
2005	130.1
2006	130.3
2007	130.5
2008	130.8