Year	Percent
1991	44.624
1992	46.332
1993	46.038
1994	46.337
1995	46.744
1996	48.206
1997	48.941
1998	48.908
1999	49.517
2000	51.701
2001	50.165
2002	50.498
2003	50.355
2004	50.209
2005	49.229
2006	49.841
2007	50.927
2008	51.042
2009	50.799
2010	51.392
2011	50.354
2012	51.489
2013	53.297
2014	53.362
2015	53.429
2016	53.562
2017	53.617
2018	53.875
2019	54.156
2020	54.423
2021	54.669
2022	55.016