Year	Percent
1991	9.754
1992	10.481
1993	10.707
1994	7.549
1995	7.81
1996	7.01
1997	8.487
1998	8.059
1999	9.446
2000	7.237
2001	8.436
2002	8.386
2003	8.361
2004	8.116
2005	8.065
2006	11.486
2007	14.43
2008	15.026
2009	14.391
2010	12.52
2011	14.485
2012	14.682
2013	13.879
2014	15.291
2015	15.071
2016	14.75
2017	15.089
2018	14.689
2019	14.294
2020	13.903
2021	13.552
2022	13.198