Year	Number
2009-01-01	33296282
2010-01-01	32882502
2011-01-01	35576278
2012-01-01	38368091
2013-01-01	40675618
2014-01-01	43664448
2015-01-01	47690645
2016-01-01	49670189
2017-01-01	53909825