Year	mm Hg
1980	122.3
1981	122.3
1982	122.3
1983	122.2
1984	122.2
1985	122.2
1986	122.1
1987	122.1
1988	122.2
1989	122.3
1990	122.3
1991	122.4
1992	122.5
1993	122.7
1994	122.8
1995	123
1996	123.2
1997	123.5
1998	123.7
1999	124
2000	124.2
2001	124.5
2002	124.7
2003	124.9
2004	125.2
2005	125.4
2006	125.7
2007	126
2008	126.2