Full FAA Chronology at this link.
19690307: A Civil Aeronautics Board rule effective this date imposed the first Federal requirement for air taxi operators to carry liability insurance covering passengers as well as persons and property on the ground. The minimum coverage was $75,000 per person and $100,000 for property damage.
19700307: Effective this date, FAA required every U.S. civil aircraft owner to submit an annual report on aircraft registration, eligibility, identification, and activity no later than June 30 of each year. The submission of the annual reports through 1977 permitted the updating of the aircraft register and the removal of about 32,000 obsolete records. On January 25, 1978, FAA revoked the annual reporting requirement because the register could now be kept largely current