Year	Percent
1991	4.002
1992	4.665
1993	5.207
1994	5.798
1995	6.641
1996	7.663
1997	8.898
1998	11.072
1999	14.342
2000	14.313
2001	13.221
2002	6.129
2003	4.909
2004	4.559
2005	4.706
2006	5.34
2007	6.627
2008	9.347
2009	9.033
2010	9.164
2011	9.125
2012	9.158
2013	9.429
2014	9.681
2015	9.652
2016	9.52
2017	9.884
2018	9.965
2019	10.073
2020	10.136
2021	10.178
2022	10.23