Year	Percent
1991	49.633
1992	50.377
1993	50.367
1994	51.128
1995	51.239
1996	48.801
1997	49.947
1998	50.163
1999	47.782
2000	49.25
2001	49.381
2002	48.014
2003	50.06
2004	50.182
2005	51.535
2006	51.505
2007	51.688
2008	51.897
2009	52.518
2010	50.597
2011	51.865
2012	56.992
2013	55.82
2014	52.161
2015	53.162
2016	52.482
2017	53.505
2018	53.782
2019	54.078
2020	54.451
2021	54.802
2022	55.148