Year % (cumulative) 2000 28.6599998474121 2001 30.5900001525879 2002 30.4200000762939 2003 30.9099998474121 2004 30.9799995422363 2005 33.4199981689453 2006 35.6100006103516 2007 36.7400016784668 2008 38.0999984741211 2009 39.3699989318848 2010 41.1500015258789 2011 43.1699981689453 2012 43.6100006103516 2013 45.9199981689453 2014 47.25 2015 51.7468605041504 2016 58.5517616271973 2017 54.7119598388672