Year	Percent
1990	60
1991	60.29
1992	60.58
1993	60.88
1994	61.17
1995	61.46
1996	61.75
1997	62.04
1998	62.33
1999	62.63
2000	62.92
2001	62.92
2002	62.92
2003	62.92
2004	62.92
2005	62.92
2006	62.92
2007	62.92
2008	62.92
2009	62.92
2010	62.92
2011	62.92
2012	62.92
2013	62.92
2014	62.92
2015	62.92