Year	Number
1971	22622
1972	23096
1973	24055
1974	23605
1975	23649
1976	23321
1977	24212
1978	24331
1979	24332
2004	19105
2005	18793
2007	18512
2013	14021
2014	14312
2015	13745
2016	14173
2017	13854
2018	14086
2019	13819
2020	12805
2021	12776
2022	12640