Year	mm Hg
1980	120.2
1981	120.2
1982	120.2
1983	120.2
1984	120.2
1985	120.2
1986	120.2
1987	120.2
1988	120.2
1989	120.3
1990	120.4
1991	120.6
1992	120.8
1993	121
1994	121.2
1995	121.5
1996	121.7
1997	122
1998	122.4
1999	122.7
2000	123
2001	123.3
2002	123.7
2003	124
2004	124.4
2005	124.7
2006	125
2007	125.3
2008	125.5