Year	mm Hg
1980	127.5
1981	127.5
1982	127.6
1983	127.6
1984	127.7
1985	127.7
1986	127.8
1987	127.8
1988	127.9
1989	128
1990	128.2
1991	128.3
1992	128.4
1993	128.5
1994	128.6
1995	128.7
1996	128.9
1997	129.1
1998	129.2
1999	129.4
2000	129.5
2001	129.7
2002	129.8
2003	130
2004	130.2
2005	130.4
2006	130.6
2007	130.8
2008	131