Year	mm Hg
1980	110.3
1981	110.7
1982	111
1983	111.3
1984	111.6
1985	111.9
1986	112.3
1987	112.7
1988	113
1989	113.4
1990	113.8
1991	114.2
1992	114.6
1993	115.1
1994	115.5
1995	115.9
1996	116.3
1997	116.6
1998	117
1999	117.3
2000	117.7
2001	118
2002	118.3
2003	118.6
2004	118.9
2005	119.2
2006	119.5
2007	119.8
2008	120.1