Year	Percent
1991	43.72
1992	40.83
1993	42.433
1994	42.75
1995	43.126
1996	38.035
1997	45.107
1998	46.217
1999	46.806
2000	48.007
2001	48.376
2002	49.741
2003	49.44
2004	48.375
2005	47.354
2006	45.753
2007	45.758
2008	44.516
2009	45.667
2010	45.956
2011	46.128
2012	45.936
2013	46.899
2014	47.126
2015	47.858
2016	47.328
2017	47.936
2018	48.136
2019	48.437
2020	48.795
2021	49.125
2022	49.393