Year	Percent
1982	24.01952
1987	29.70471
1988	29.41961
1989	27.68567
1994	16.05517
1995	16.51705
1996	18.00678
1999	25.362
2000	28.57095
2001	35.52258
2002	40.26448
2003	43.85336
2004	45.8111
2005	50.56313
2006	52.40343
2007	52.16096
2008	52.8084
2009	52.6348
2010	59.78632
2011	54.87489
2012	50.2234
2014	53.9322
2015	55.38803