Year	mm Hg
1980	129.1
1981	128.7
1982	128.3
1983	128
1984	127.6
1985	127.3
1986	126.9
1987	126.6
1988	126.4
1989	126.1
1990	125.8
1991	125.5
1992	125.1
1993	124.8
1994	124.5
1995	124.1
1996	123.8
1997	123.6
1998	123.5
1999	123.4
2000	123.5
2001	123.7
2002	123.8
2003	124
2004	124.2
2005	124.5
2006	124.7
2007	125
2008	125.2