| 年份 |
总产量 |
收购量 |
净收购 |
收购占产量
比重（％） |
净收购占产量
比重（％） |
| 1952 |
16391.5 |
3327.0 |
2819.0 |
23.3 |
17.2 |
| 1953 |
16683.0 |
4746.0 |
3588.5 |
28.4 |
21.5 |
| 1954 |
16951.5 |
5181.0 |
3158.5 |
30.6 |
18.6 |
| 1955 |
18393.5 |
5074.5 |
3617.5 |
27.6 |
19.7 |
| 1956 |
19274.5 |
4544.0 |
2870.0 |
23.6 |
14.9 |
| 1957 |
19504.5 |
4804.0 |
3387.0 |
24.6 |
17.4 |
| 1958 |
20000.0 |
5876.0 |
4172.5 |
29.4 |
20.9 |
| 1959 |
17000.0 |
6740.5 |
4756.6 |
39.7 |
28.0 |
| 1960 |
14350.0 |
5106.0 |
3089.5 |
35.6 |
21.5 |
| 1961 |
14750.0 |
4047.0 |
2580.5 |
27.4 |
17.5 |
| 1962 |
16000.0 |
3814.5 |
2572.0 |
23.8 |
16.1 |
| 1963 |
17000.0 |
4396.5 |
2892.0 |
25.0 |
17.0 |
| 1964 |
18750.0 |
4742.5 |
3184.5 |
25.3 |
17.6 |
| 1965 |
19452.5 |
4868.5 |
4359.5 |
25.0 |
17.3 |
| 1966 |
21400.0 |
5158.0 |
3824.0 |
24.1 |
17.9 |
| 1967 |
21782.0 |
4935.5 |
3774.0 |
22.7 |
17.3 |
| 1968 |
20905.5 |
4869.5 |
3786.5 |
23.3 |
18.1 |
| 1969 |
21097.0 |
4667.5 |
3382.5 |
22.1 |
16.0 |
| 1970 |
23995.5 |
5443.5 |
4202.0 |
22.7 |
17.5 |
| 1971 |
25014.0 |
5302.0 |
3982.0 |
21.2 |
15.9 |
| 1972 |
24048.0 |
4829.5 |
3392.0 |
20.1 |
14.1 |
| 1973 |
26193.5 |
5612.0 |
4100.5 |
21.2 |
15.5 |
| 1974 |
27527.0 |
5907.0 |
4397.5 |
21.1 |
16.0 |
| 1975 |
28451.5 |
6086.0 |
4394.5 |
21.4 |
15.4 |
|