Year	Percent
1998-01-01	23.580300000000000
1999-01-01	23.668600000000000
2000-01-01	27.700000000000000
2001-01-01	24.100000000000000
2002-01-01	22.781999999999996
2003-01-01	21.297600000000000
2004-01-01	20.665500000000000
2005-01-01	19.436900000000000
2006-01-01	22.230200000000000
2007-01-01	31.840500000000000
2008-01-01	25.187500000000000
2009-01-01	28.094800000000000
2010-01-01	30.093600000000000
2011-01-01	29.864800000000000
2012-01-01	31.472800000000000
2013-01-01	25.891000000000000
2014-01-01	27.621400000000000
2015-01-01	36.661700000000000
2016-01-01	42.594200000000000