Year	mm Hg
1980	122.6
1981	122.7
1982	122.8
1983	123
1984	123.3
1985	123.6
1986	123.8
1987	124.1
1988	124.4
1989	124.7
1990	124.9
1991	125.1
1992	125.3
1993	125.5
1994	125.6
1995	125.7
1996	125.9
1997	126
1998	126.2
1999	126.4
2000	126.5
2001	126.7
2002	126.9
2003	127.1
2004	127.3
2005	127.5
2006	127.7
2007	127.8
2008	127.9