Year	Percent
1992-01-01	2.40029
1993-01-01	6.56810
1994-01-01	8.12923
1995-01-01	6.28324
1996-01-01	9.28365
1997-01-01	16.84290
1998-01-01	21.37830
1999-01-01	25.83540
2000-01-01	38.09050
2001-01-01	41.63980
2002-01-01	33.87410
2003-01-01	30.23060
2004-01-01	24.69360
2005-01-01	18.74050
2006-01-01	28.05680
2007-01-01	78.40780
2008-01-01	74.20760
2009-01-01	52.31770
2010-01-01	62.28430
2011-01-01	50.94240
2012-01-01	42.07360
2013-01-01	40.27450
2014-01-01	47.70700
2015-01-01	63.81970
2016-01-01	67.28120
2017-01-01	64.99240