Year	Percent
1991	10.787
1992	10.302
1993	11.445
1994	10.624
1995	11.827
1996	10.842
1997	9.953
1998	10.859
1999	9.549
2000	10.789
2001	8.225
2002	9.584
2003	8.427
2004	9.195
2005	8.751
2006	8.935
2007	8.189
2008	6.604
2009	10.152
2010	9.274
2011	9.581
2012	9.549
2013	9.539
2014	9.938
2015	10.676
2016	11.185
2017	11.21
2018	11.093
2019	10.982
2020	10.89
2021	10.806
2022	10.73