Year Percent 1993-01-01 5.0028200000000000 1994-01-01 6.3539900000000005 1995-01-01 6.4340400000000000 1996-01-01 8.4417500000000000 1997-01-01 9.5825100000000010 1998-01-01 9.9405399999999990 1999-01-01 9.9757400000000000 2000-01-01 11.5928000000000000 2001-01-01 12.8718000000000000 2002-01-01 15.3320000000000000 2003-01-01 16.8610000000000000 2004-01-01 17.9884000000000000 2005-01-01 18.0957000000000000 2006-01-01 20.1052000000000000 2007-01-01 25.6270000000000000 2008-01-01 30.4038000000000000 2009-01-01 32.5756000000000000 2010-01-01 37.9682000000000000 2011-01-01 38.9330000000000000 2012-01-01 43.2542000000000000 2013-01-01 51.2155000000000000 2014-01-01 59.9165000000000000 2015-01-01 67.1259000000000000 2016-01-01 71.8872000000000000