Year	Percent
1995	0.43496
1996	0.44069
1997	0.43363
1998	0.43917
1999	0.43683
2000	0.42246
2001	0.41495
2002	0.4186
2003	0.41149
2004	0.41314
2005	0.41103
2006	0.41832
2007	0.41598
2008	0.6799
2009	0.41288
2010	0.41105
2011	0.40904
2012	0.41546
2013	0.4099
2014	0.42541
2015	0.42239
2016	0.41026
2017	0.67978
2018	0.4177
2019	0.6953
2020	0.71321