Year Percent 1995-01-01 3.7125500000000000 1996-01-01 3.3921699999999997 1997-01-01 3.5822000000000000 1998-01-01 3.5974100000000000 1999-01-01 3.4955500000000000 2000-01-01 36.3769999999999950 2001-01-01 40.5595000000000000 2002-01-01 43.0222000000000000 2003-01-01 52.3366000000000000 2004-01-01 76.7497000000000000 2005-01-01 0.1591390000000000 2006-01-01 2.2336700000000000 2007-01-01 10.1225000000000000 2008-01-01 7.2369699999999995 2009-01-01 7.1093300000000000 2010-01-01 4.7782500000000000 2011-01-01 2.7694799999999997 2012-01-01 1.6197200000000000 2013-01-01 2.5887000000000000 2014-01-01 8.2946400000000000 2015-01-01 8.7750200000000000 2016-01-01 12.4420000000000000