Year	Percent
1990-01-01	76.9714346009896
1991-01-01	87.5687731945548
1992-01-01	84.1324399586112
1993-01-01	95.0240209072836
1994-01-01	93.9753267267986
1995-01-01	88.7147995795860
1996-01-01	87.4650211924334
1997-01-01	84.6877758001879
1998-01-01	77.9808154785329
1999-01-01	76.5353106018996
2000-01-01	82.3527396765735
2001-01-01	86.6443286316418
2002-01-01	89.6447953467894
2003-01-01	81.4797631903082
2004-01-01	77.3544399603224
2005-01-01	69.8712912699077
2006-01-01	68.8417777903664
2007-01-01	66.1029162132379
2008-01-01	61.3632128085630
2009-01-01	65.1978254953263
2010-01-01	64.6471542215861
2011-01-01	65.6904724743448
2012-01-01	60.7549324433144
2013-01-01	68.1527490559204
2014-01-01	69.8916944144286
2015-01-01	68.1440551435362
2016-01-01	73.6261022667402
2017-01-01	66.5611323017664