Year	Years
1990	74.3
1991	74.3
1992	74.5
1993	74.9
1994	75.3
1995	75.5
1996	75.5
1997	75.8
1998	76.1
1999	76.3
2000	76.7
2001	76.9
2002	77.2
2003	77.6
2004	78
2005	78.4
2006	78.7
2007	79
2008	79.2
2009	79.3
2010	79.5
2011	79.7
2012	79.8
2013	79.8