Year	Percent
1991-01-01	35.0069999694824
1992-01-01	37.2970008850098
1993-01-01	42.3800010681152
1994-01-01	49.0279998779297
1995-01-01	51.3050003051758
1996-01-01	52.6469993591309
1997-01-01	52.1969985961914
1998-01-01	53.1879997253418
1999-01-01	57.3089981079102
2000-01-01	51.6739997863770
2001-01-01	52.2529983520508
2002-01-01	55.3180007934570
2003-01-01	56.3260002136230
2004-01-01	59.3479995727539
2005-01-01	59.9080009460449
2006-01-01	62.4199981689453
2007-01-01	58.6399993896484
2008-01-01	47.2999992370605
2009-01-01	50.3720016479492
2010-01-01	57.3400001525879
2011-01-01	58.5180015563965
2012-01-01	59.7550010681152
2013-01-01	58.8160018920898
2014-01-01	62.6599998474121
2015-01-01	62.3180007934570
2016-01-01	54.3100013732910
2017-01-01	54.8909988403320