Year	Percent
1992	46.46712
1993	45.01367
1994	44.56756
1995	43.86243
1996	43.67535
1997	43.70413
1998	43.81925
1999	43.15729
2000	43.17168
2001	43.21485
2002	43.22924
2003	43.25802
2004	35.86128
2005	36.26421
2006	36.23543
2007	36.22104
2008	36.17787
2009	35.94762
2010	35.40078
2011	35.1475
2012	35.04101
2013	35.77637
2014	34.76759
2015	34.79781
2016	34.451
2017	34.31861
2018	34.16607
2019	34.14304
2020	34.21931
2021	34.24809