Year	Percent
1994	13.26276
1995	11.81918
1996	13.01619
1997	11.41816
1998	11.71395
1999	10.6504
2000	9.68101
2001	8.47216
2002	8.03195
2003	6.98085
2004	11.14032
2005	8.98999
2006	11.3868
2007	8.92584
2008	10.12804
2009	10.0214
2010	9.00274
2011	8.3425
2012	8.10589
2013	7.59868
2014	7.83505
2015	7.40889
2016	7.60383
2017	7.04055
2018	7.35965
2019	7.05402
2020	7.10161
2021	6.31675