Year	Percent
1991	6.568
1992	6.454
1993	6.551
1994	6.398
1995	6.279
1996	6.517
1997	6.225
1998	6.357
1999	6.897
2000	6.864
2001	6.452
2002	6.642
2003	6.991
2004	6.92
2005	6.993
2006	7.582
2007	7.219
2008	7.115
2009	7.555
2010	7.516
2011	7.878
2012	8.045
2013	8.134
2014	8.421
2015	8.463
2016	10.498
2017	10.553
2018	10.544
2019	10.535
2020	10.525
2021	10.515
2022	10.506