Year	mm Hg
1980	125.4
1981	125.4
1982	125.4
1983	125.3
1984	125.3
1985	125.3
1986	125.3
1987	125.2
1988	125.3
1989	125.3
1990	125.3
1991	125.3
1992	125.3
1993	125.2
1994	125.1
1995	125
1996	125
1997	125
1998	124.9
1999	124.9
2000	124.8
2001	124.8
2002	124.8
2003	124.7
2004	124.8
2005	124.9
2006	125
2007	125.1
2008	125.2