Year	Percent
1991	35.146
1992	33.522
1993	34.416
1994	35.816
1995	36.878
1996	36.116
1997	38.183
1998	44.812
1999	42.913
2000	44.512
2001	39.959
2002	41.214
2003	41.014
2004	39.414
2005	41.813
2006	45.24
2007	44.903
2008	45.287
2009	45.158
2010	45.719
2011	46.86
2012	43.943
2013	46.026
2014	45.27
2015	44.866
2016	44.513
2017	44.447
2018	44.377
2019	44.304
2020	44.228
2021	44.149
2022	44.068