Year Percent 1995-01-01 8.64197000000000 1996-01-01 12.69060000000000 1997-01-01 19.61370000000000 1998-01-01 29.28970000000000 1999-01-01 43.69890000000000 2000-01-01 49.74350000000000 2001-01-01 47.62930000000000 2002-01-01 58.62450000000000 2003-01-01 74.36860000000000 2004-01-01 100.54299999999999 2005-01-01 140.60700000000000 2006-01-01 179.20600000000000 2007-01-01 186.17700000000002 2008-01-01 106.20700000000001 2009-01-01 20.19410000000000 2010-01-01 11.82190000000000 2011-01-01 14.13070000000000 2012-01-01 16.63260000000000