Year	Percent
1991	11.153
1992	11.321
1993	11.36
1994	11.616
1995	11.893
1996	12.05
1997	12.292
1998	13.092
1999	13.545
2000	14.259
2001	14.587
2002	15.035
2003	16.103
2004	17.042
2005	18.061
2006	19.313
2007	20.121
2008	21.067
2009	22.098
2010	22.865
2011	23.789
2012	25.034
2013	26.304
2014	27.39
2015	28.853
2016	29.719
2017	30.667
2018	31.776
2019	32.819
2020	33.807
2021	34.838
2022	35.635