Year	Percent
1991	33.786
1992	35.987
1993	41.244
1994	44.044
1995	46.177
1996	46.475
1997	46.467
1998	46.506
1999	49.352
2000	44.624
2001	48.755
2002	54.187
2003	52.994
2004	50.36
2005	48.759
2006	47.983
2007	45.667
2008	46.854
2009	50.603
2010	51.177
2011	48.018
2012	49.277
2013	50.809
2014	52.51
2015	51.561
2016	52.67
2017	52.521
2018	52.711
2019	53.056
2020	53.431
2021	53.931
2022	54.143