Year	Years
1990	47
1991	47.5
1992	48
1993	48.6
1994	49.2
1995	49.9
1996	50.7
1997	51.3
1998	51.9
1999	52.4
2000	53
2001	53.7
2002	54.5
2003	55.4
2004	56.3
2005	57.3
2006	58.3
2007	59.1
2008	59.7
2009	60.3
2010	60.7
2011	61
2012	61.3
2013	61.6