1977—Subsec. (b). Pub. L. 95–30, § 602(a), substituted “July 1, 1977” for “July 1, 1976” in introductory provisions preceding par. (1) and in par. (2) substituted “$30,000,000 multiplied by the number of whole one-tenth” for “$62,500,000 multiplied by the number of one-half” and “such quarter exceeded 6 per centum” for “such calendar quarter exceeded 6 percent”.

Subsec. (c). Pub. L. 95–30, § 602(b), substituted “five successive calendar quarters beginning with the calendar quarter which begins July 1, 1977, exceed $2,250,000,000” for “five calendar quarters beginning with the calendar quarter which begins July 1, 1976, exceed $1,250,000,000”.

1976—Subsec. (d)(1). Pub. L. 94–447 substituted “6 percent, or” for “6 percent, and”.