Year	Percent
1991	16.781
1992	10.297
1993	8.065
1994	7.35
1995	9.207
1996	12.872
1997	8.061
1998	9.094
1999	11.158
2000	6.887
2001	10.113
2002	10.349
2003	6.117
2004	5.79
2005	4.9
2006	5.99
2007	6.136
2008	5.603
2009	5.107
2010	5.207
2011	5.078
2012	5.472
2013	5.02
2014	4.945
2015	5.582
2016	6.125
2017	5.951
2018	5.921
2019	5.923
2020	5.914
2021	5.904
2022	5.861