Year	Number
1970	157470
1974	118710
1975	143632
1987	109359
1991	163602
1997	0
1999	33025
2000	20886
2001	23214
2002	23310
2003	20691
2004	4898
2005	11985
2006	18925
2007	24025
2008	20935
2009	19872
2010	2754
2011	4888
2012	6069
2013	15848
2014	32547
2015	36786
2016	21844
2017	24868
2018	27507
2019	26727
2020	36021
2021	34663