Year	Percent
1992	42.99767
1993	40.63674
1994	41.35217
1995	41.70989
1996	34.56592
1997	34.6731
1998	36.6303
1999	36.34412
2000	20.90786
2001	21.06882
2002	21.12248
2003	21.37088
2004	21.01351
2005	21.63891
2006	21.97841
2007	21.47809
2008	23.03445
2009	23.22207
2010	23.83318
2011	23.69559
2012	23.78315
2013	28.0055
2014	26.95483
2015	27.46766
2016	27.6249
2017	26.74934
2018	26.51705
2019	26.87442
2020	26.89421
2021	26.37598