1981

1981: 17 577 companies

1月 1 726 companies

2月 931 companies

3月 1 431 companies

4月 1 637 companies

5月 1 603 companies

6月 1 463 companies

7月 1 677 companies

8月 1 442 companies

9月 1 412 companies

10月 1 562 companies

11月 1 236 companies

12月 1 457 companies