Year	Percent
1991	48.151
1992	49.192
1993	50.244
1994	51.832
1995	52.163
1996	50.783
1997	50.488
1998	50.487
1999	50.539
2000	50.459
2001	50.206
2002	47.387
2003	48.33
2004	48.592
2005	49.168
2006	49.502
2007	48.937
2008	48.263
2009	47.444
2010	46.973
2011	47.435
2012	46.669
2013	44.433
2014	45.537
2015	45.328
2016	44.126
2017	43.933
2018	43.698
2019	43.416
2020	43.088
2021	42.706
2022	42.273