Year	Years
1990	72
1991	72.5
1992	73
1993	73.5
1994	73.8
1995	74.2
1996	74.7
1997	75.1
1998	75.4
1999	75.8
2000	76.3
2001	76.8
2002	77.3
2003	77.8
2004	78.3
2005	78.8
2006	79.2
2007	79.5
2008	79.7
2009	79.8
2010	80
2011	80.3
2012	80.4
2013	80.5