Year	Percent
1995	19.98315
1996	41.2139
1997	42
1998	38
1999	28
2000	20.55128
2001	19.07744
2002	18.55987
2003	18.84448
2004	19.4
2005	27.20295
2006	21.63272
2007	25.37017
2008	27.07356
2009	19.78212
2010	16.33543
2011	18.74002
2012	19.21775
2013	18.16609
2014	19.11526
2015	18.65574
2016	19.62492
2017	20.47805