Year	Percent
1991	7.099
1992	7.335
1993	7.599
1994	7.688
1995	7.714
1996	7.746
1997	8.533
1998	9.587
1999	9.857
2000	10.752
2001	12.131
2002	13.619
2003	15.462
2004	17.24
2005	19.149
2006	22.375
2007	25.741
2008	30.102
2009	35.368
2010	41.746
2011	41.524
2012	42.231
2013	41.903
2014	42.091
2015	42.94
2016	42.893
2017	41.93
2018	41.86
2019	41.814
2020	41.779
2021	41.676
2022	41.573