Year	Number
1971	388802
1999	592131
2002	551915
2003	561043
2004	549884
2005	531496
2006	528465
2007	522791
2009	484680
2010	490700
2011	498810
2012	548719
2014	636062
2015	700500
2016	711699
2017	649418
2018	797796