Year	Percent
1991	14.627
1992	15.216
1993	11.876
1994	10.969
1995	10.627
1996	10.69
1997	10.427
1998	9.605
1999	9.63
2000	8.959
2001	8.97
2002	15.539
2003	15.564
2004	14.938
2005	15.015
2006	14.881
2007	12.484
2008	12.027
2009	11.08
2010	11.515
2011	11.434
2012	11.756
2013	11.135
2014	12.959
2015	14.515
2016	14.158
2017	14.374
2018	14.436
2019	14.459
2020	14.449
2021	14.408
2022	14.316