Year	mm Hg
1980	119.1
1981	119.5
1982	119.8
1983	120.2
1984	120.6
1985	121
1986	121.3
1987	121.7
1988	122.1
1989	122.5
1990	122.8
1991	123.1
1992	123.4
1993	123.7
1994	123.9
1995	124.1
1996	124.3
1997	124.5
1998	124.6
1999	124.8
2000	124.9
2001	125
2002	125
2003	125.1
2004	125.2
2005	125.2
2006	125.2
2007	125.2
2008	125.1