Year	Number
1971	658793
1972	661317
1973	681245
1978	731167
1994	437203
1997	366848
1999	566674
2000	548136
2001	576600
2002	594328
2003	586026
2004	557921
2012	533366
2014	551189
2016	387074
2017	346211
2018	291329
2019	187859
2020	101352
2021	43811