Year	mm Hg
1980	130.8
1981	130.9
1982	131
1983	131
1984	131.1
1985	131.1
1986	131.1
1987	131.1
1988	131
1989	131
1990	131
1991	130.9
1992	130.9
1993	130.8
1994	130.8
1995	130.7
1996	130.7
1997	130.6
1998	130.5
1999	130.5
2000	130.5
2001	130.4
2002	130.4
2003	130.4
2004	130.3
2005	130.2
2006	130.2
2007	130
2008	129.9