Year	Percent
1992	0.374
1993	0.333
1994	0.283
1995	0.25
1996	0.242
1997	0.237
1998	0.226
1999	0.224
2000	0.235
2001	0.261
2002	0.278
2003	0.292
2004	0.304
2005	0.318
2006	0.335
2007	0.346
2008	0.347
2009	0.353
2010	0.359
2011	0.371
2012	0.377
2013	0.386
2014	0.389
2015	0.381
2016	0.373
2017	0.374
2018	0.376
2019	0.376
2020	0.375
2021	0.374
2022	0.373
2023	0.376
2024	0.38