Year	Percent
1991-01-01	30.7110004425049
1992-01-01	33.0069999694824
1993-01-01	42.1809997558594
1994-01-01	44.8860015869141
1995-01-01	41.8110008239746
1996-01-01	41.7760009765625
1997-01-01	39.0309982299805
1998-01-01	35.3870010375977
1999-01-01	29.0990009307861
2000-01-01	25.2420005798340
2001-01-01	20.7049999237061
2002-01-01	21.5429992675781
2003-01-01	22.3320007324219
2004-01-01	22.5289993286133
2005-01-01	19.7180004119873
2006-01-01	17.9470005035400
2007-01-01	18.1690006256104
2008-01-01	24.5739994049072
2009-01-01	37.9199981689453
2010-01-01	41.6809997558594
2011-01-01	46.4049987792969
2012-01-01	53.0909996032715
2013-01-01	55.6689987182617
2014-01-01	53.3510017395020
2015-01-01	48.4539985656738
2016-01-01	44.5429992675781
2017-01-01	38.7470016479492