Year	mm Hg
1980	122.9
1981	123
1982	123
1983	123
1984	123.1
1985	123.1
1986	123.1
1987	123.2
1988	123.3
1989	123.3
1990	123.3
1991	123.2
1992	123
1993	123
1994	123
1995	123
1996	123.2
1997	123.4
1998	123.7
1999	124.1
2000	124.4
2001	124.7
2002	125
2003	125.2
2004	125.5
2005	125.7
2006	125.9
2007	126.2
2008	126.4