Year	Percent
1991	58.738
1992	63.742
1993	53.701
1994	54.298
1995	50.732
1996	51.536
1997	50.134
1998	55.37
1999	55.838
2000	49.114
2001	51.745
2002	48.252
2003	48.242
2004	48.463
2005	55.018
2006	56.863
2007	55.856
2008	53.171
2009	48.511
2010	51.209
2011	48.821
2012	48.838
2013	49.722
2014	48.937
2015	48.74
2016	48.727
2017	48.662
2018	48.594
2019	48.525
2020	48.453
2021	48.381
2022	48.308