Year	Percent
1991	13.978
1992	13.207
1993	11.506
1994	10.305
1995	7.748
1996	7.198
1997	7.003
1998	6.497
1999	6.497
2000	4.446
2001	2.962
2002	4.122
2003	3.796
2004	2.706
2005	3.224
2006	3.184
2007	3.059
2008	2.409
2009	2.609
2010	2.808
2011	2.461
2012	2.518
2013	2.262
2014	2.237
2015	2.506
2016	1.998
2017	1.988
2018	1.93
2019	1.857
2020	1.792
2021	1.73
2022	1.672