Year	Percent
1990-01-01	54.7942
1991-01-01	51.3773
1992-01-01	47.0487
1993-01-01	42.7079
1994-01-01	40.7885
1995-01-01	36.7967
1996-01-01	31.0609
1997-01-01	23.2109
1998-01-01	25.4703
1999-01-01	30.3976
2000-01-01	28.2343
2001-01-01	32.4702
2002-01-01	32.8781
2003-01-01	33.8427
2004-01-01	35.1803
2005-01-01	32.0518
2006-01-01	33.3646
2007-01-01	33.6279
2008-01-01	31.7113
2009-01-01	43.5756
2010-01-01	44.0463
2011-01-01	41.4820
2012-01-01	46.3417
2013-01-01	45.9063
2014-01-01	45.4725
2015-01-01	45.4712
2016-01-01	46.7400