Year	Percent
1991	10.394
1992	10.671
1993	10.559
1994	10.268
1995	10.32
1996	10.463
1997	10.52
1998	10.625
1999	10.6
2000	11.309
2001	11.218
2002	11.543
2003	11.995
2004	12.187
2005	12.404
2006	12.773
2007	13.727
2008	13.795
2009	13.786
2010	13.948
2011	14.192
2012	14.256
2013	14.789
2014	15.02
2015	14.85
2016	14.584
2017	14.498
2018	14.399
2019	14.295
2020	14.279
2021	14.266
2022	14.318