Year	Number
2008-01-01	115172
2009-01-01	136732
2010-01-01	132792
2011-01-01	218145
2012-01-01	230627
2013-01-01	291583
2014-01-01	432723
2015-01-01	499490
2016-01-01	497232
2017-01-01	485107