Year	Number
1971	74953
1972	49191
1973	48966
1978	13239
1979	4677
2008	8225
2009	10003
2010	21510
2011	24104
2012	29246
2013	34606
2014	36981
2015	39946
2016	38638
2017	35358
2018	32201
2019	27025
2020	23953
2021	24304