Year	Percent
1991	12.228
1992	12.53
1993	12.879
1994	12.629
1995	12.486
1996	12.846
1997	12.144
1998	12.534
1999	14.057
2000	12.672
2001	13.587
2002	11.925
2003	9.966
2004	8.583
2005	8.92
2006	11.438
2007	11.507
2008	11.952
2009	10.599
2010	11.189
2011	10.82
2012	12.624
2013	13.293
2014	11.352
2015	14.239
2016	11.77
2017	11.625
2018	11.37
2019	11.236
2020	11.167
2021	11.155
2022	11.195