Year	Number
1970	14485
1971	15674
1972	14642
1973	14773
1975	22588
1998	52053
1999	48784
2000	461185
2001	487344
2002	534587
2003	566770
2004	602252
2005	624784
2006	630593
2007	637173
2008	637442
2009	634067
2010	700725
2011	682718
2012	708121
2013	726867
2014	743402
2015	781286
2016	800004
2017	798478
2018	788570