Year	mm Hg
1980	127.1
1981	127.1
1982	127.2
1983	127.2
1984	127.2
1985	127.2
1986	127.2
1987	127.2
1988	127.2
1989	127.2
1990	127.2
1991	127.4
1992	127.6
1993	127.8
1994	128
1995	128.2
1996	128.3
1997	128.4
1998	128.4
1999	128.4
2000	128.4
2001	128.3
2002	128.2
2003	128.1
2004	128
2005	127.9
2006	127.8
2007	127.7
2008	127.7