Year	Percent
1991-01-01	40.0730018615723
1992-01-01	39.9939994812012
1993-01-01	39.9609985351563
1994-01-01	39.8800010681152
1995-01-01	39.8549995422363
1996-01-01	39.7599983215332
1997-01-01	40.1100006103516
1998-01-01	40.1010017395020
1999-01-01	40.3819999694824
2000-01-01	40.7249984741211
2001-01-01	41.1710014343262
2002-01-01	41.6349983215332
2003-01-01	42.0740013122559
2004-01-01	42.3400001525879
2005-01-01	42.4469985961914
2006-01-01	42.4970016479492
2007-01-01	42.3919982910156
2008-01-01	42.7010002136230
2009-01-01	42.9780006408691
2010-01-01	42.8069992065430
2011-01-01	42.9109992980957
2012-01-01	43.1370010375977
2013-01-01	43.4230003356934
2014-01-01	43.6240005493164
2015-01-01	43.8050003051758
2016-01-01	44.0419998168945
2017-01-01	44.0569992065430