Year	mm Hg
1980	125.1
1981	125.1
1982	125.1
1983	125
1984	125
1985	125
1986	124.9
1987	124.9
1988	124.9
1989	125
1990	125
1991	125
1992	125
1993	125
1994	125
1995	125
1996	125
1997	125
1998	125
1999	125
2000	125
2001	125
2002	125.1
2003	125.2
2004	125.2
2005	125.3
2006	125.4
2007	125.5
2008	125.6