Year	Percent
1991-01-01	42.2089996337891
1992-01-01	42.4259986877441
1993-01-01	41.5519981384277
1994-01-01	42.3600006103516
1995-01-01	41.1829986572266
1996-01-01	41.7859992980957
1997-01-01	41.5859985351563
1998-01-01	41.2389984130859
1999-01-01	42.6539993286133
2000-01-01	41.9659996032715
2001-01-01	41.3839988708496
2002-01-01	40.5810012817383
2003-01-01	40.5610008239746
2004-01-01	41.3279991149902
2005-01-01	41.3440017700195
2006-01-01	42.0660018920898
2007-01-01	43.8639984130859
2008-01-01	44.3310012817383
2009-01-01	44.3839988708496
2010-01-01	43.4640007019043
2011-01-01	43.0670013427734
2012-01-01	42.8489990234375
2013-01-01	42.8800010681152
2014-01-01	42.3370018005371
2015-01-01	41.7089996337891
2016-01-01	41.9090003967285
2017-01-01	42.1969985961914