Year	mm Hg
1980	124.4
1981	124.5
1982	124.6
1983	124.7
1984	124.7
1985	124.8
1986	124.9
1987	124.9
1988	125
1989	125
1990	125.1
1991	125.1
1992	125
1993	125
1994	124.9
1995	124.9
1996	124.8
1997	124.7
1998	124.7
1999	124.6
2000	124.7
2001	124.7
2002	124.8
2003	124.8
2004	125
2005	125.1
2006	125.2
2007	125.3
2008	125.4