Year	Percent
1995	22.3409
1996	19.2064
1997	10.78319
1998	9.9658
1999	11.48346
2000	13.11063
2001	10.10813
2002	9.20514
2003	8.97152
2004	8.24843
2005	8.72708
2006	12.31379
2007	13.74247
2008	14.12751
2009	21.35974
2010	24.18044
2011	21.09111
2012	19.72928
2013	18.59529
2014	18.37393
2015	20.43543
2016	20.0896
2017	22.16425