1981

1981: 18 235 companies

januari 1 464 companies

februari 1 629 companies

maart 1 835 companies

april 1 690 companies

mei 1 564 companies

juni 1 567 companies

juli 1 400 companies

augustus 1 366 companies

september 1 522 companies

oktober 1 405 companies

november 1 405 companies

december 1 388 companies