Year	mm Hg
1980	116.3
1981	116.5
1982	116.8
1983	117.1
1984	117.4
1985	117.6
1986	117.9
1987	118.1
1988	118.3
1989	118.4
1990	118.6
1991	118.7
1992	118.9
1993	119.2
1994	119.4
1995	119.7
1996	120
1997	120.3
1998	120.7
1999	121
2000	121.3
2001	121.6
2002	121.9
2003	122.2
2004	122.4
2005	122.7
2006	122.9
2007	123
2008	123.1