Year Percent 1993-01-01 2.459730000000000 1994-01-01 3.379090000000000 1995-01-01 3.151810000000000 1996-01-01 3.992100000000000 1997-01-01 5.230650000000000 1998-01-01 5.673230000000000 1999-01-01 5.354230000000000 2000-01-01 5.931990000000000 2001-01-01 5.879450000000000 2002-01-01 6.154930000000000 2003-01-01 6.844080000000000 2004-01-01 8.121030000000001 2005-01-01 8.579139999999999 2006-01-01 10.023900000000000 2007-01-01 13.950700000000000 2008-01-01 21.038400000000000 2009-01-01 23.806100000000000 2010-01-01 25.031600000000000 2011-01-01 26.956999999999997 2012-01-01 32.550300000000000 2013-01-01 43.771100000000000 2014-01-01 55.442200000000000 2015-01-01 65.714200000000000 2016-01-01 73.846800000000000