Year	Years
1990	75
1991	75.8
1992	76.3
1993	76.5
1994	76.6
1995	76.7
1996	77
1997	77.4
1998	77.8
1999	78.2
2000	78.6
2001	78.8
2002	79.1
2003	79.5
2004	79.8
2005	80.2
2006	80.4
2007	80.7
2008	80.9
2009	81.2
2010	81.5
2011	81.8
2012	81.8
2013	81.9