1981

1981: 17 577 companies

januari 1 726 companies

februari 931 companies

maart 1 431 companies

april 1 637 companies

mei 1 603 companies

juni 1 463 companies

juli 1 677 companies

augustus 1 442 companies

september 1 412 companies

oktober 1 562 companies

november 1 236 companies

december 1 457 companies