Year	Percent
2001-01-01	5.15969913946566
2002-01-01	5.48461227911014
2003-01-01	6.13625324037587
2004-01-01	6.88457658398243
2005-01-01	7.58021274993789
2006-01-01	6.89942766219462
2007-01-01	5.88833529523226
2008-01-01	5.93713019456454
2009-01-01	8.65243131728785
2010-01-01	8.69213198670488
2011-01-01	7.84019828229066
2012-01-01	8.21538221520064
2013-01-01	8.20305047811569
2014-01-01	8.19153336157016
2015-01-01	7.56115060675202
2016-01-01	7.35986637623749
2017-01-01	6.97251200693207