Year	Percent
1991	49.027
1992	49.099
1993	42.46
1994	39.714
1995	40.909
1996	44.347
1997	44.314
1998	40.698
1999	42.428
2000	43.078
2001	45.381
2002	43.414
2003	41.957
2004	39.41
2005	38.07
2006	36.546
2007	35.523
2008	35.088
2009	34.842
2010	34.493
2011	33.344
2012	31.402
2013	29.709
2014	25.632
2015	25.678
2016	25.371
2017	25.773
2018	25.663
2019	25.65
2020	25.718
2021	25.89
2022	25.918