Year	Percent
1991	38.705
1992	40.401
1993	41.341
1994	39.87
1995	39.027
1996	38.589
1997	39.552
1998	40.024
1999	38.838
2000	40.077
2001	40.466
2002	38.328
2003	37.556
2004	40.662
2005	43.167
2006	45.078
2007	46.123
2008	46.937
2009	46.498
2010	45.841
2011	46.367
2012	46.32
2013	46.628
2014	47.145
2015	47.108
2016	45.933
2017	45.932
2018	45.88
2019	45.992
2020	46.033
2021	46.049
2022	46.049