Year	Percent
1991	54.761
1992	53.212
1993	53.22
1994	52.233
1995	54.242
1996	53.609
1997	53.542
1998	53.7
1999	53.353
2000	53.174
2001	51.984
2002	50.401
2003	45.427
2004	41.864
2005	42.94
2006	42.127
2007	44.981
2008	45.664
2009	42.852
2010	42.888
2011	42.022
2012	40.545
2013	43.986
2014	46.579
2015	45.335
2016	43.869
2017	43.894
2018	43.621
2019	43.253
2020	42.862
2021	42.396
2022	41.921