Year	Percent
1997-01-01	35.81717824448000
1998-01-01	50.49313574862530
1999-01-01	12.72517701300850
2000-01-01	12.20894563089770
2001-01-01	9.22203707560887
2002-01-01	10.12872467222900
2003-01-01	9.79241974934510
2004-01-01	13.28588608717960
2005-01-01	17.15220493543540
2006-01-01	23.07703734513810
2007-01-01	18.54851363257790
2008-01-01	31.99010394925730
2009-01-01	16.95747580259450
2010-01-01	13.34005235378000
2011-01-01	14.32090216638700
2012-01-01	10.63793534316310
2013-01-01	8.10583270875443
2014-01-01	6.99849943966393
2015-01-01	5.24573284929382
2016-01-01	5.43125332073936
2017-01-01	5.69029619929012