Year	mm Hg
1980	122.6
1981	122.9
1982	123.2
1983	123.5
1984	123.8
1985	124.1
1986	124.3
1987	124.6
1988	124.9
1989	125.3
1990	125.6
1991	125.9
1992	126.1
1993	126.4
1994	126.6
1995	126.7
1996	126.9
1997	127.1
1998	127.3
1999	127.6
2000	127.9
2001	128.2
2002	128.5
2003	128.9
2004	129.3
2005	129.6
2006	130.1
2007	130.5
2008	130.8