Year	Percent
1991	6.788
1992	6.616
1993	6.362
1994	6.487
1995	7.135
1996	7.818
1997	7.183
1998	7.901
1999	8.644
2000	7.349
2001	7.088
2002	9.029
2003	8.328
2004	6.902
2005	12.909
2006	10.293
2007	9.658
2008	10.087
2009	11.51
2010	12.283
2011	9.436
2012	10.694
2013	9.619
2014	8.96
2015	7.65
2016	8.313
2017	8.26
2018	8.203
2019	7.961
2020	7.795
2021	7.533
2022	7.289