Year	Percent
1983-01-01	7.113239999999999
1984-01-01	6.828520000000000
1985-01-01	5.241650000000000
1986-01-01	4.360170000000000
1987-01-01	10.035200000000000
1988-01-01	8.583800000000000
1989-01-01	6.963080000000001
1990-01-01	4.295030000000001
1991-01-01	12.651800000000000
1992-01-01	5.586860000000000
1993-01-01	12.907600000000000
1994-01-01	10.210000000000000
1995-01-01	9.907510000000000
1996-01-01	8.016919999999999
1997-01-01	8.878710000000000
1998-01-01	7.942960000000000
1999-01-01	6.410220000000000
2000-01-01	8.693250000000000
2001-01-01	10.879600000000000
2002-01-01	12.544500000000000
2003-01-01	12.597400000000000
2004-01-01	22.433400000000000
2005-01-01	21.882500000000000
2006-01-01	22.358300000000000
2007-01-01	24.832700000000000
2008-01-01	23.575900000000000
2009-01-01	31.443500000000000
2010-01-01	38.643900000000000
2011-01-01	40.582800000000000
2012-01-01	33.697300000000000
2013-01-01	40.688200000000000
2014-01-01	46.282100000000000
2015-01-01	47.995200000000000
2016-01-01	49.530100000000000