Year	Percent
1991	49.903
1992	51.783
1993	45.237
1994	46.325
1995	46.741
1996	48.36
1997	49.441
1998	51.487
1999	50.324
2000	51.348
2001	53.114
2002	51.626
2003	52.465
2004	53.806
2005	53.006
2006	52.215
2007	52.508
2008	51.461
2009	47.382
2010	44.356
2011	40.882
2012	41.081
2013	42.343
2014	42.602
2015	42.753
2016	42.49
2017	41.13
2018	41.311
2019	41.7
2020	42.221
2021	42.837
2022	43.42