Year	Percent
1991	33.9358
1992	29.71481
1993	33.09767
1994	30.16836
1995	31.34655
1996	30.95381
1997	30.18164
1998	26.9864
1999	22.79819
2000	19.03917
2001	18.22573
2002	22.73418
2003	22.72283
2004	22.49013
2005	22.92141
2006	24.11339
2007	24.01622
2008	26.84575
2009	27.9106
2010	27.30938
2011	26.48487
2012	25.51771
2013	24.25291
2014	24.65547
2015	23.56632
2016	23.62728
2017	26.07496
2018	25.54256
2019	24.76978
2020	26.88197
2021	26.89459
2022	26.72629