Year
.
1969
40 900
---
40 600
1970
41 000
38 100
36 639
1971
50 900
51 100
40 850
1972
42 700
42 700
40 425
1973
53 800
56 800
55 945
1974
53 900
---
54 898
1975
57 000
---
53 273
1976
59 700
---
43 100
1977
40 800
---
39 756
1978
33 900
---
9 110