Year	Years
1990	79.1
1991	79.2
1992	79.4
1993	79.6
1994	79.8
1995	79.9
1996	80.3
1997	80.6
1998	80.6
1999	80.7
2000	81.1
2001	81.4
2002	81.7
2003	81.8
2004	82
2005	82.2
2006	82.3
2007	82.5
2008	82.6
2009	82.8
2010	83
2011	82.8
2012	83.2
2013	83.3