Year	Percent
1991	8.086
1992	6.771
1993	6.992
1994	8.757
1995	10.53
1996	15.629
1997	5.763
1998	9.942
1999	6.018
2000	4.809
2001	4.739
2002	2.576
2003	3.767
2004	2.781
2005	2.114
2006	2.06
2007	2.1
2008	2.095
2009	3.859
2010	2.537
2011	2.827
2012	3.147
2013	2.716
2014	2.701
2015	2.62
2016	2.263
2017	2.225
2018	2.23
2019	2.188
2020	2.188
2021	2.166
2022	2.176