Year	Number
2007	17866000
2008	16100000
2009	15961000
2010	17741000
2011	20335000
2012	21755000
2013	23988000
2014	22637000
2015	23336000
2016	25226000
2017	27067000
2018	27977000
2019	29346000
2020	11251000