Year	Percent
1996	36.41086
1997	31.54344
1998	28.78565
1999	25.91875
2000	24.51541
2001	22.71616
2002	22.02511
2003	21.97826
2004	20.53749
2005	18.84531
2006	17.70835
2007	17.15362
2008	16.83705
2009	16.79438
2010	17.95587
2011	18.22679
2012	18.7668
2013	19.56516
2014	19.99018
2015	19.78021
2016	19.84999
2017	19.02213
2018	18.4295
2019	18.38933
2020	19.22522
2021	18.35813
2022	18.62282