Year	Percent
1991	53.562
1992	53.44
1993	53.634
1994	53.956
1995	53.985
1996	53.368
1997	52.929
1998	52.731
1999	51.875
2000	52.569
2001	53.476
2002	53.91
2003	54.814
2004	53.306
2005	53.023
2006	52.803
2007	52.518
2008	52.67
2009	51.581
2010	52.345
2011	53.171
2012	51.376
2013	54.459
2014	55.097
2015	55.219
2016	54.242
2017	53.669
2018	52.833
2019	51.971
2020	51.214
2021	50.508
2022	49.728