Year	Percent
1991	8.315
1992	7.853
1993	7.282
1994	7.527
1995	7.684
1996	8.557
1997	8.41
1998	8.321
1999	7.926
2000	8.525
2001	8.426
2002	8.431
2003	8.525
2004	8.592
2005	8.747
2006	9.73
2007	9.817
2008	9.428
2009	9.323
2010	8.959
2011	9.02
2012	8.737
2013	8.503
2014	8.309
2015	7.888
2016	7.491
2017	7.498
2018	7.432
2019	7.353
2020	7.282
2021	7.202
2022	7.139