Year	Percent
1991	6.399
1992	6.542
1993	6.595
1994	6.495
1995	6.236
1996	6.919
1997	6.56
1998	6.478
1999	6.134
2000	6.187
2001	7.06
2002	7.687
2003	8.348
2004	9.055
2005	9.53
2006	9.898
2007	10.373
2008	10.853
2009	11.14
2010	12.141
2011	11.784
2012	11.901
2013	11.998
2014	12.18
2015	12.439
2016	12.288
2017	12.506
2018	12.532
2019	12.544
2020	12.588
2021	12.616
2022	12.639