Year	Number
2008-01-01	522471
2009-01-01	1285553
2010-01-01	1601466
2011-01-01	2196270
2012-01-01	2738795
2013-01-01	2695139
2014-01-01	3134754
2015-01-01	3435189
2016-01-01	3591579