Year	Percent
1991-01-01	40.6870002746582
1992-01-01	37.9809989929199
1993-01-01	36.0000000000000
1994-01-01	36.0000000000000
1995-01-01	29.7800006866455
1996-01-01	24.6350002288818
1997-01-01	24.5419998168945
1998-01-01	28.2469997406006
1999-01-01	33.6949996948242
2000-01-01	37.2260017395020
2001-01-01	38.5929985046387
2002-01-01	36.3429985046387
2003-01-01	35.8209991455078
2004-01-01	32.7350006103516
2005-01-01	32.3170013427734
2006-01-01	28.8689994812012
2007-01-01	24.9899997711182
2008-01-01	23.5639991760254
2009-01-01	25.0990009307861
2010-01-01	32.2220001220703
2011-01-01	36.5550003051758
2012-01-01	42.0250015258789
2013-01-01	50.0180015563965
2014-01-01	45.5569992065430
2015-01-01	42.4440002441406
2016-01-01	31.3390007019043
2017-01-01	27.3670005798340