Year	mm Hg
1980	124.5
1981	124.6
1982	124.7
1983	124.8
1984	124.9
1985	125
1986	125.1
1987	125.3
1988	125.5
1989	125.7
1990	125.9
1991	126.1
1992	126.3
1993	126.5
1994	126.7
1995	126.9
1996	127
1997	127.2
1998	127.3
1999	127.5
2000	127.7
2001	127.9
2002	128.2
2003	128.4
2004	128.7
2005	128.9
2006	129.2
2007	129.5
2008	129.7