Year	Percent
1991	11.449
1992	11.902
1993	10.056
1994	10.281
1995	9.573
1996	11.109
1997	11.154
1998	10.167
1999	13.381
2000	10.583
2001	8.758
2002	13.052
2003	10.62
2004	11.157
2005	10.215
2006	9.16
2007	10.026
2008	9.401
2009	9.547
2010	9.488
2011	7.949
2012	7.037
2013	8.415
2014	9.654
2015	11.763
2016	11.443
2017	10.887
2018	10.384
2019	9.961
2020	9.642
2021	9.377
2022	9.167