The 1973 Agreement called for a seven-year transition from national to international management, but continued until 1976 to carve out "technical and operational management of the system the U.S. signatory the Communications Satellite Corporation had also served as the Manager of the global system under the interim arrangements in force from 1964 to 1973". Later phases of the transition resulted in full international governance by 1980. Financial contribution to the organization, its so-called "investment share", was strictly proportional to each member's use of the system, determined annually; and this corresponded to the weighted vote each would have on the Board of Governors.