1980

1980: 19 167 companies

1月 1 576 companies

2月 1 682 companies

3月 1 709 companies

4月 1 599 companies

5月 1 523 companies

6月 1 416 companies

7月 1 593 companies

8月 1 392 companies

9月 1 496 companies

10月 1 679 companies

11月 1 615 companies

12月 1 887 companies