Year	mm Hg
1980	119.5
1981	119.8
1982	120.1
1983	120.4
1984	120.7
1985	121
1986	121.3
1987	121.6
1988	121.9
1989	122.1
1990	122.3
1991	122.5
1992	122.8
1993	123
1994	123.1
1995	123.3
1996	123.5
1997	123.7
1998	123.9
1999	124.1
2000	124.3
2001	124.5
2002	124.7
2003	124.9
2004	125.1
2005	125.3
2006	125.4
2007	125.6
2008	125.8