Year	Percent
1986-01-01	1.47334894725915
1987-01-01	2.11008372951747
1988-01-01	2.84775663692758
1989-01-01	4.32194849376132
1990-01-01	5.16321872794966
1991-01-01	6.03131157655825
1992-01-01	7.73013201302870
1993-01-01	6.75882448613169
1994-01-01	5.57301245242888
1995-01-01	3.67578953029758
1996-01-01	4.33497782265285
1997-01-01	4.77955258608880
1998-01-01	5.04671468011722
1999-01-01	5.68223132083518
2000-01-01	5.55689460443295
2001-01-01	4.16299734500566
2002-01-01	3.24696900900622
2003-01-01	3.44829063592530
2004-01-01	2.34550329240819
2005-01-01	1.85140767482260
2006-01-01	1.92944670165732
2007-01-01	1.50723143274875
2008-01-01	2.21906489640011
2009-01-01	3.71330106070391
2010-01-01	3.70129591904487
2011-01-01	2.99103652668445
2012-01-01	3.96727377311659
2013-01-01	3.63012534185885
2014-01-01	3.08849092503366
2015-01-01	3.23330135878662
2016-01-01	3.16568714181344
2017-01-01	2.86167724514924