Year	Number
1970	456731
1971	457967
1972	463997
1974	482234
1975	482981
1978	478147
1979	480612
1980	467951
1981	442574
1982	489705
1983	456274
1997	515818
1999	324671
2000	287553
2001	311134
2002	248265
2004	158612
2005	132451
2006	106371
2007	85554
2008	83648
2011	57393
2012	117369
2013	168654
2014	212849
2015	224221
2016	246387
2017	229971
2018	208885
2019	213999
2020	211505
2021	181414
2022	178653