Year	mm Hg
1980	123.8
1981	123.8
1982	123.9
1983	123.9
1984	123.9
1985	123.9
1986	124
1987	124
1988	123.9
1989	123.9
1990	123.9
1991	123.9
1992	124
1993	124
1994	124.1
1995	124.1
1996	124.2
1997	124.3
1998	124.4
1999	124.5
2000	124.6
2001	124.8
2002	124.9
2003	125
2004	125.1
2005	125.2
2006	125.2
2007	125.3
2008	125.3