Year Percent 1995-01-01 2.853010000000000 1996-01-01 6.532830000000001 1997-01-01 7.776160000000001 1998-01-01 6.539630000000001 1999-01-01 5.776110000000000 2000-01-01 6.146790000000000 2001-01-01 9.746130000000000 2002-01-01 8.490950000000000 2003-01-01 9.431189999999999 2004-01-01 10.279700000000000 2005-01-01 14.858900000000000 2006-01-01 23.056500000000000 2007-01-01 32.182500000000000 2008-01-01 49.429200000000000 2009-01-01 34.251000000000000 2010-01-01 32.387800000000000 2011-01-01 12.172300000000000 2012-01-01 12.179800000000000 2013-01-01 11.745500000000000 2014-01-01 11.276300000000000 2015-01-01 10.611600000000000