Year	mm Hg
1980	122.5
1981	122.4
1982	122.4
1983	122.3
1984	122.3
1985	122.3
1986	122.3
1987	122.3
1988	122.4
1989	122.4
1990	122.4
1991	122.5
1992	122.5
1993	122.6
1994	122.8
1995	122.9
1996	123
1997	123.2
1998	123.3
1999	123.4
2000	123.6
2001	123.9
2002	124
2003	124.2
2004	124.3
2005	124.6
2006	124.8
2007	125
2008	125.2