Year	Percent
1991	30.763
1992	32.67
1993	33.176
1994	35.234
1995	36.229
1996	36.91
1997	38.141
1998	39.237
1999	40.973
2000	40.083
2001	40.385
2002	42.042
2003	42.843
2004	42.944
2005	43.048
2006	43.602
2007	43.722
2008	42.819
2009	43.969
2010	44.811
2011	44.47
2012	44.742
2013	44.96
2014	45.558
2015	45.462
2016	45.092
2017	45.215
2018	45.609
2019	46.009
2020	46.412
2021	46.833
2022	47.208