Year	Number
1971	1316615
1972	1343668
1973	1377750
1978	1398363
1994	904432
1997	747103
1999	724172
2000	665530
2001	652531
2002	632955
2003	610612
2004	554112
2012	555302
2014	569399
2016	387762
2017	334047
2018	264622
2019	157627
2020	72393
2021	22733