Year	Years
1990	49.4
1991	48.9
1992	48.3
1993	47.6
1994	15.6
1995	42
1996	45.2
1997	36.3
1998	44.8
1999	48.1
2000	50
2001	51.2
2002	52.7
2003	54.2
2004	55.7
2005	57.3
2006	59.3
2007	61
2008	62.2
2009	62.9
2010	63.7
2011	64.3
2012	64.7
2013	65.3