Year	Percent
1994	26.78401
1995	25.792
1996	33.52092
1997	29.92625
1998	30.98629
1999	28.29447
2000	44.51342
2001	34.545
2002	38.0516
2003	41.98881
2004	40.17398
2005	43.40486
2006	44.51535
2007	43.56058
2008	38.72671
2009	38.35327
2010	35.37742
2011	33.11421
2012	33.18206
2013	32.33238
2014	31.70146
2015	33.10437
2016	33.82744
2017	34.08068