Year	Percent
1995-01-01	42.5204732434155
1996-01-01	42.5359306916304
1997-01-01	42.2111864296860
1998-01-01	41.6229430310370
1999-01-01	41.0879455589651
2000-01-01	40.6030766506681
2001-01-01	40.2471871218051
2002-01-01	39.0966578267701
2003-01-01	38.1112175677750
2004-01-01	38.0152730147711
2005-01-01	38.3429148155372
2006-01-01	38.1182135565067
2007-01-01	37.4879829557888
2008-01-01	37.4477599294782
2009-01-01	37.5738584436733
2010-01-01	37.5863695675487
2011-01-01	37.8425543417544
2012-01-01	37.8731161270989
2013-01-01	37.8284102127616
2014-01-01	38.4480462661362
2015-01-01	38.7761991018227
2016-01-01	38.7211863255810
2017-01-01	38.5197947572891