Year	Percent
2000-01-01	72.2638203784017
2001-01-01	72.6200949275698
2002-01-01	73.4682248032032
2003-01-01	73.1138717119605
2004-01-01	73.5361789087086
2005-01-01	73.4812710985971
2006-01-01	73.9798919184090
2007-01-01	74.1031308841976
2008-01-01	74.2620153667039
2009-01-01	73.2669267485792
2010-01-01	73.7853219324650
2011-01-01	74.4157034111350
2012-01-01	74.7351059135548
2013-01-01	75.0565912059884
2014-01-01	75.7682200350336
2015-01-01	75.9891589024238
2016-01-01	76.1633436195636
2017-01-01	76.3490225194971