Year	Percent
1991	46.494
1992	48.442
1993	48.553
1994	47.66
1995	49.467
1996	47.348
1997	47.412
1998	47.468
1999	47.269
2000	46.593
2001	47.129
2002	46.944
2003	44.962
2004	45.686
2005	44.684
2006	44.958
2007	44.797
2008	45.108
2009	45.177
2010	44.307
2011	62.695
2012	36.918
2013	52.289
2014	57.678
2015	47.94
2016	46.73
2017	46.254
2018	46.092
2019	45.948
2020	45.731
2021	45.582
2022	45.478