Year	Percent
1991	48.872
1992	49.238
1993	49.717
1994	49.928
1995	49.792
1996	49.769
1997	49.042
1998	49.305
1999	55.762
2000	54.2
2001	47.801
2002	50.689
2003	55.018
2004	61.076
2005	60.675
2006	62.578
2007	60.381
2008	57.932
2009	53.434
2010	51.118
2011	44.954
2012	42.257
2013	38.61
2014	37.257
2015	36.491
2016	23.474
2017	23.553
2018	23.465
2019	23.424
2020	23.356
2021	23.337
2022	23.314