Year	mm Hg
1980	123.9
1981	123.9
1982	123.9
1983	124
1984	124
1985	124
1986	124
1987	124
1988	124.1
1989	124.1
1990	124.2
1991	124.2
1992	124.3
1993	124.4
1994	124.5
1995	124.6
1996	124.7
1997	124.8
1998	124.9
1999	125
2000	125.1
2001	125.2
2002	125.3
2003	125.4
2004	125.5
2005	125.6
2006	125.7
2007	125.7
2008	125.8