Year	Percent
1997-01-01	23.530500000000000
1998-01-01	5.009030000000000
1999-01-01	1.651650000000000
2000-01-01	4.012060000000000
2001-01-01	24.407300000000000
2002-01-01	13.649200000000000
2003-01-01	24.543200000000000
2004-01-01	21.552500000000000
2005-01-01	26.163200000000000
2006-01-01	28.398700000000000
2007-01-01	31.703300000000000
2008-01-01	41.596000000000004
2009-01-01	39.078600000000000
2010-01-01	34.129200000000000
2011-01-01	26.352700000000000
2012-01-01	16.053900000000000
2013-01-01	14.579900000000000
2014-01-01	17.067400000000000
2015-01-01	19.176800000000000
2016-01-01	14.099300000000000