Year	Percent
1993	21.46218
1994	37.14388
1995	33.09741
1996	33.58342
1997	36.39996
1998	40.82271
1999	35.46396
2000	27.11762
2001	21.56071
2002	24.97198
2003	33.78872
2004	33.18276
2005	37.02089
2006	70.54558
2007	97.16497
2008	46.66484
2009	72.10169
2010	77.49925
2011	68.10976
2012	61.53307
2013	73.72311
2014	68.34894
2015	61.90876
2016	61.87059
2017	73.04553