Year	Percent
1991	7.884
1992	8.195
1993	8.439
1994	8.345
1995	8.498
1996	7.744
1997	7.859
1998	7.664
1999	6.732
2000	6.709
2001	7.483
2002	8.122
2003	9.161
2004	9.378
2005	9.362
2006	10.148
2007	9.709
2008	9.328
2009	7.766
2010	5.464
2011	7.211
2012	5.252
2013	5.161
2014	5.193
2015	5.992
2016	7.193
2017	7.351
2018	7.394
2019	7.369
2020	7.324
2021	7.279
2022	7.257