Year	Percent
1991	50.275
1992	48.573
1993	52.196
1994	52.234
1995	50.853
1996	51.781
1997	50.678
1998	51.367
1999	51.331
2000	53.508
2001	55.882
2002	58.35
2003	62.779
2004	65.133
2005	65.332
2006	66.008
2007	66.201
2008	66.857
2009	64.519
2010	62.872
2011	60.269
2012	60.208
2013	61.107
2014	62.865
2015	62.857
2016	63.117
2017	64.06
2018	64.21
2019	64.276
2020	64.393
2021	64.413
2022	64.383