§ Total number of persons, aged 16 to 64 years, insured against unemployment, classified as belonging to the silk and artificial silk industry at 1st July of each year, and numbers recorded as unemployed at the end of June:
| Year. | Numbers insured at 1st July. | Numbers Unemployed at end of June. | Differences. | |
| 1925 | … | 45,620 | 2.870 | 42,750 |
| 1926 | … | 49,440 | 5,470 | 43,970 |
| 1927 | … | 53,550 | 3,170 | 50,380 |
| 1928 | … | 69,770 | 3,406 | 66,364 |
| 1929 | … | 73,480 | 5,907 | 67,573 |
§ These figures include. in addition to workers engaged in the production of artificial silk yarn, workers employed by firms whose principal business consists in the weaving of artificial silk, or the throwing, spinning or weaving of natural silk. Statistics of the numbers insured at dates subsequent to 1st July, 1929, are not available.