Year Percent 1993-01-01 2.44218 1994-01-01 8.12696 1995-01-01 14.11000 1996-01-01 21.21470 1997-01-01 26.98910 1998-01-01 31.73510 1999-01-01 35.84020 2000-01-01 38.76910 2001-01-01 42.70690 2002-01-01 43.29570 2003-01-01 58.82610 2004-01-01 59.76670 2005-01-01 58.99890 2006-01-01 58.00170 2007-01-01 63.07220 2008-01-01 43.49250 2009-01-01 68.85200 2010-01-01 61.33050 2011-01-01 50.63630 2012-01-01 54.31130 2013-01-01 49.81730 2014-01-01 49.33430 2015-01-01 52.86570 2016-01-01 75.75380