Year	Percent
1996-01-01	17.501500000000000
1997-01-01	16.282700000000000
1998-01-01	14.832500000000000
1999-01-01	12.349700000000000
2000-01-01	9.982530000000000
2001-01-01	7.881869999999999
2002-01-01	6.668800000000000
2003-01-01	6.832150000000000
2004-01-01	8.647080000000000
2005-01-01	16.479400000000000
2006-01-01	29.715500000000000
2007-01-01	43.723200000000000
2008-01-01	35.623100000000000
2009-01-01	31.248000000000000
2010-01-01	32.949800000000000
2011-01-01	27.241800000000000
2012-01-01	20.718700000000000
2013-01-01	21.347500000000000
2014-01-01	23.264900000000000
2015-01-01	22.831100000000000
2016-01-01	23.408600000000000
2017-01-01	22.583900000000000