Year	Percent
1991	34.091
1992	35.228
1993	35.842
1994	37.387
1995	39.234
1996	40.222
1997	38.1
1998	39.705
1999	40.137
2000	41.057
2001	43.751
2002	46.601
2003	48.044
2004	48.344
2005	47.083
2006	48.023
2007	59.325
2008	67.62
2009	65.417
2010	64.102
2011	60.939
2012	58.555
2013	58.787
2014	60.675
2015	61.892
2016	62.308
2017	62.951
2018	62.419
2019	62.581
2020	62.446
2021	62.338
2022	62.439