Year	Percent
2000-01-01	71.5341623638847
2001-01-01	72.0157975230274
2002-01-01	71.2142529605352
2003-01-01	71.4963678122020
2004-01-01	70.6939498821361
2005-01-01	72.6786832764971
2006-01-01	74.7343476851862
2007-01-01	76.0289473203974
2008-01-01	78.9104806670234
2009-01-01	79.8245829063745
2010-01-01	80.0470754441895
2011-01-01	79.0250914781053
2012-01-01	78.0835272160375
2013-01-01	77.7594271844678
2014-01-01	75.6013076517411
2015-01-01	74.2700041613418
2016-01-01	74.2163949661775
2017-01-01	73.9470451806151