Year	Percent
1989	47.49151
1990	46.46886
1991	43.95978
1992	46.72559
1993	43.41692
1994	44.0851
1995	42.22624
1996	40.49829
1997	51.85271
1998	33.93877
1999	34.31198
2000	33.63025
2001	32.68319
2002	33.3863
2003	32.08611
2004	30.52135
2005	28.29514
2006	26.72967
2007	25.78815
2008	24.17648
2009	24.20538
2010	22.59579
2011	20.79126
2012	18.54849
2013	17.9305
2014	17.84879
2015	17.58776
2016	17.23018
2017	16.19976
2018	15.70919
2019	16.05034
2020	16.33776
2021	16.0677
2022	14.86888