Year	Percent
1989-01-01	4.200200000000000
1990-01-01	3.743930000000000
1991-01-01	5.323250000000000
1992-01-01	6.700010000000001
1993-01-01	7.713290000000000
1994-01-01	7.681510000000000
1995-01-01	10.302600000000000
1996-01-01	16.423400000000000
1997-01-01	22.314700000000000
1998-01-01	26.759700000000000
1999-01-01	31.526200000000000
2000-01-01	30.843500000000000
2001-01-01	26.151300000000000
2002-01-01	26.642100000000000
2003-01-01	29.722600000000000
2004-01-01	38.803700000000000
2005-01-01	66.098100000000000
2006-01-01	82.014700000000000
2007-01-01	88.733200000000000
2008-01-01	76.231300000000000
2009-01-01	47.483300000000000
2010-01-01	40.482400000000000
2011-01-01	27.830300000000000
2012-01-01	19.181600000000000
2013-01-01	20.594400000000000
2014-01-01	20.997300000000000
2015-01-01	18.616800000000000
2016-01-01	12.606600000000000
2017-01-01	13.792200000000000