Year	Percent
1991	42.224
1992	28.492
1993	38.064
1994	29.28
1995	47.276
1996	50.115
1997	49.864
1998	44.11
1999	44.437
2000	53.488
2001	54.288
2002	51.336
2003	52.556
2004	41.92
2005	43.094
2006	43.508
2007	42.728
2008	43.675
2009	41.329
2010	42.951
2011	47.664
2012	47.433
2013	48.123
2014	47.182
2015	45.241
2016	43.792
2017	43.12
2018	42.959
2019	42.94
2020	42.917
2021	42.894
2022	42.871