Year	mm Hg
1980	118.3
1981	118.5
1982	118.7
1983	118.8
1984	118.9
1985	119
1986	119.1
1987	119.3
1988	119.5
1989	119.7
1990	119.9
1991	120.1
1992	120.4
1993	120.7
1994	120.9
1995	121.2
1996	121.5
1997	121.7
1998	121.9
1999	122.1
2000	122.3
2001	122.5
2002	122.7
2003	122.9
2004	123.2
2005	123.4
2006	123.6
2007	123.8
2008	124