Year	Number
2004-01-01	2.533983664
2005-01-01	3.755523523
2006-01-01	4.710963460
2007-01-01	5.238120836
2008-01-01	6.166342154
2009-01-01	6.872746185
2010-01-01	7.183739148
2011-01-01	10.788094440
2012-01-01	10.611856470
2013-01-01	6.935712450
2014-01-01	11.949098350