Year	Number
1971	3382
1972	3821
1973	2812
1974	2823
1975	2759
1976	2808
1977	2677
1978	2778
1979	2737
1980	2702
1981	2750
1982	2844
1983	2852
1984	2934
1985	2830
1997	2729
1999	2607
2000	2366
2001	2377
2008	3211
2009	3255
2016	2796
2017	2834
2019	2889
2020	2880
2021	2946
2022	2907