Year	Number
2004-01-01	21724
2005-01-01	30405
2006-01-01	30276
2007-01-01	24768
2008-01-01	23496
2009-01-01	21933
2010-01-01	22392
2011-01-01	29783
2012-01-01	31413
2013-01-01	48759
2014-01-01	71718
2015-01-01	129720
2016-01-01	170010