Year	Percent
1987-01-01	12.908900000000000
1988-01-01	11.810500000000000
1989-01-01	14.252800000000000
1990-01-01	10.631900000000000
1991-01-01	11.902000000000001
1992-01-01	13.727500000000000
1993-01-01	18.368500000000000
1994-01-01	17.500800000000000
1995-01-01	19.731200000000000
1996-01-01	21.995000000000000
1997-01-01	23.048800000000000
1998-01-01	23.879300000000000
1999-01-01	28.933900000000000
2000-01-01	22.080000000000000
2001-01-01	19.630000000000000
2002-01-01	16.440000000000000
2003-01-01	19.550000000000000
2004-01-01	20.620000000000000
2005-01-01	21.810000000000000
2006-01-01	28.200000000000000
2007-01-01	29.300000000000000
2008-01-01	17.550000000000000
2009-01-01	30.800000000000000
2010-01-01	35.170000000000000
2011-01-01	36.200000000000000
2012-01-01	43.710000000000000
2013-01-01	50.050000000000000
2014-01-01	50.060000000000000
2015-01-01	55.350000000000000
2016-01-01	57.700000000000000