Year	Years
1990	73.8
1991	74.1
1992	74.3
1993	74.4
1994	74.5
1995	74.6
1996	74.8
1997	75.1
1998	75.4
1999	75.6
2000	76
2001	76.5
2002	77
2003	77.2
2004	77.3
2005	77.4
2006	77.7
2007	78
2008	78.3
2009	78.6
2010	78.8
2011	78.9
2012	79.1
2013	79.3