Year	Percent
1990-01-01	51.905100000000000
1991-01-01	53.495300000000000
1992-01-01	54.443900000000000
1993-01-01	55.602600000000000
1994-01-01	59.751999999999995
1995-01-01	63.572800000000000
1996-01-01	61.454900000000000
1997-01-01	57.806600000000000
1998-01-01	57.634800000000000
1999-01-01	51.712300000000000
2000-01-01	50.468000000000000
2001-01-01	47.230800000000000
2002-01-01	55.127700000000000
2003-01-01	54.287700000000000
2004-01-01	57.208900000000000
2005-01-01	39.441200000000000
2006-01-01	36.668400000000000
2007-01-01	31.613900000000000
2008-01-01	29.807700000000000
2009-01-01	33.601900000000000
2010-01-01	36.280400000000000
2011-01-01	39.774400000000000
2012-01-01	44.760300000000000
2013-01-01	41.391000000000005
2014-01-01	39.869000000000000
2015-01-01	38.257900000000000
2016-01-01	36.634800000000000