Year	mm Hg
1980	120.3
1981	120.6
1982	120.8
1983	121.1
1984	121.3
1985	121.5
1986	121.8
1987	122
1988	122.2
1989	122.4
1990	122.7
1991	122.9
1992	123.1
1993	123.3
1994	123.5
1995	123.6
1996	123.8
1997	123.9
1998	124.1
1999	124.2
2000	124.3
2001	124.5
2002	124.6
2003	124.7
2004	124.8
2005	124.8
2006	124.9
2007	125
2008	125