Year Percent 1994-01-01 1.9524700000000001 1995-01-01 1.5859999999999999 1996-01-01 2.4693700000000000 1997-01-01 2.4891600000000000 1998-01-01 3.4301400000000000 1999-01-01 3.1838900000000003 2000-01-01 3.3257600000000000 2001-01-01 8.0840800000000000 2002-01-01 7.0024200000000000 2003-01-01 11.3168000000000000 2004-01-01 14.1502000000000000 2005-01-01 15.1950000000000000 2006-01-01 18.4794000000000000 2007-01-01 26.6417000000000000 2008-01-01 27.1645000000000000 2009-01-01 42.1459000000000000 2010-01-01 38.0581000000000000 2011-01-01 44.5401000000000000 2012-01-01 20.2267000000000000 2013-01-01 26.4729000000000000 2014-01-01 22.9278000000000000 2015-01-01 25.2526000000000000 2016-01-01 21.8832000000000000