Year	mm Hg
1980	117.5
1981	117.8
1982	118.2
1983	118.5
1984	118.8
1985	119
1986	119.3
1987	119.6
1988	119.9
1989	120.2
1990	120.5
1991	120.8
1992	121.2
1993	121.5
1994	121.9
1995	122.2
1996	122.5
1997	122.8
1998	123
1999	123.2
2000	123.4
2001	123.7
2002	123.9
2003	124.2
2004	124.5
2005	124.8
2006	125.1
2007	125.4
2008	125.8