Year	Percent
1989-01-01	0.345129
1990-01-01	1.856430
1991-01-01	4.349460
1992-01-01	4.259160
1993-01-01	5.431970
1994-01-01	9.717480
1995-01-01	17.489800
1996-01-01	19.033000
1997-01-01	15.931400
1998-01-01	14.543000
1999-01-01	19.531100
2000-01-01	36.524800
2001-01-01	41.452100
2002-01-01	25.625300
2003-01-01	26.959800
2004-01-01	30.578200
2005-01-01	35.075900
2006-01-01	37.469300
2007-01-01	42.214500
2008-01-01	36.517400
2009-01-01	38.077900
2010-01-01	47.433200
2011-01-01	43.204300
2012-01-01	39.757400
2013-01-01	37.682200
2014-01-01	37.749300
2015-01-01	37.858500
2016-01-01	34.657600
2017-01-01	35.756100