Year	Percent
1983-01-01	2.3409299999999997
1984-01-01	3.7805199999999997
1985-01-01	3.9020900000000003
1986-01-01	7.2496199999999990
1987-01-01	3.6712200000000000
1988-01-01	1.7258700000000000
1989-01-01	3.1980900000000000
1990-01-01	4.8617200000000000
1991-01-01	9.5407700000000000
1992-01-01	7.7923200000000000
1993-01-01	12.7256000000000000
1994-01-01	23.6269000000000000
1995-01-01	9.7425300000000000
1996-01-01	8.1533500000000000
1997-01-01	40.1646000000000000
1998-01-01	11.3883000000000000
1999-01-01	27.9675000000000000
2000-01-01	19.8739000000000000
2001-01-01	23.0472000000000000
2002-01-01	20.4264000000000000
2003-01-01	20.4277000000000000
2004-01-01	20.0598000000000000
2005-01-01	17.1064000000000000
2006-01-01	15.6327000000000000
2007-01-01	14.1128000000000000
2008-01-01	14.2272000000000000
2009-01-01	19.7103000000000000
2010-01-01	19.5446000000000000
2011-01-01	23.7412000000000000
2012-01-01	23.6698000000000000
2013-01-01	24.3986000000000000
2014-01-01	24.5336000000000000
2015-01-01	25.5095000000000000
2016-01-01	22.5198000000000000