Year	Number
2006-01-01	12328554
2007-01-01	14120145
2008-01-01	15597136
2009-01-01	17293162
2010-01-01	19580760
2011-01-01	22254644
2012-01-01	25100625
2013-01-01	28152402
2014-01-01	31458726
2015-01-01	34803856
2016-01-01	38627591