Year	Number
1970	3061
1971	3246
1972	3086
1973	3258
1974	3421
1975	3461
1976	3560
1977	3686
1978	3822
1979	4226
1995	6486
2007	8614
2008	9005
2009	9583
2014	9822
2015	9773
2016	9991
2017	9640
2018	9591
2019	9433
2020	9303
2021	9266