Year	mm Hg
1980	116.8
1981	117.1
1982	117.3
1983	117.6
1984	117.8
1985	118
1986	118.2
1987	118.4
1988	118.7
1989	118.9
1990	119.2
1991	119.4
1992	119.7
1993	119.9
1994	120.2
1995	120.4
1996	120.7
1997	120.9
1998	121.2
1999	121.4
2000	121.7
2001	121.9
2002	122.1
2003	122.3
2004	122.5
2005	122.7
2006	122.8
2007	123
2008	123