Year	Percent
1991	67.588
1992	50.893
1993	48.174
1994	53.082
1995	54.93
1996	47.601
1997	49.37
1998	46.872
1999	47.69
2000	50.814
2001	50.714
2002	50.924
2003	44.656
2004	45.521
2005	49.74
2006	48.915
2007	49.119
2008	48.229
2009	48.135
2010	47.693
2011	47.375
2012	46.255
2013	46.447
2014	46.93
2015	45.972
2016	44.757
2017	45.248
2018	45.139
2019	45.027
2020	44.906
2021	44.781
2022	44.654