Year	Percent
1994	32.9504
1995	32.90103
1996	28.47891
1997	27.37126
1998	24.61776
1999	25.03722
2000	23.92386
2001	25.1097
2002	27.13368
2003	25.68396
2004	33.53998
2005	30.61071
2006	32.59296
2007	33.59119
2008	28.91936
2009	29.251
2010	37.02594
2011	40.47022
2012	40.08242
2013	40.48285
2014	38.82243
2015	37.13845
2016	35.32467
2017	35.24138