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As required by law, all United States coins are currently dated with the year of their issuance or minting. In 1964, however, a coin shortage caused speculation in rolls and bags of 1964 coins. To prevent such speculation, Congress passed legislation declaring that the United States Mint could still use the 1964 date on coinage after the 1964 calendar year. So in 1965, all denominations of United States coins continued to be struck with the 1964 date. In 1965, Congress mandated that the United States Mint continue to use the 1964 date on all 90 percent silver coins. However, because clad coins (which were not 90 percent silver) were not as likely to spark speculation, they would be dated no earlier than 1965. This meant that all of the 90 percent silver coins (half-dollar, quarter-dollar, and 10-cent coins) that the United States Mint manufactured in 1964, 1965, and 1966 bore the date 1964. (The last of the 90 percent silver quarter-dollar coins was struck in January 1966, the last of the 10-cent coins in February 1966, and the last of the half-dollar coins in April 1966.) All of the clad coins actually manufactured in 1965 bear the 1965 date. The clad coins were struck with the 1965 date through July 31, 1966. (The first clad 10-cent coin was struck in December 1965, the first clad quarter-dollar coin in August 1965, and the first clad half-dollar coin in December 1965.) As one step toward catching up on normal coin dating, in December 1965, the 1964 date on five-cent coins and one-cent coins was changed to 1965. From December 1965 through July 31, 1966, all one-cent coins and five-cent coins were struck with the 1965 date. All denominations of United States coins minted from August 1 through December 31, 1966 carried the 1966 date. Normal dating procedures resumed on January 1, 1967, and continued through 1974. In 1973, to honor the upcoming United States Bicentennial, new legislation authorized design changes in the reverse designs of the one-dollar coins, the half-dollar coin and the quarter-dollar coin. A symbolic date (1776-1976) took the place of the usual single year designation. The only single-dated coins issued during 1975 and 1976 were the 10-cent coin, the five-cent coin, and the one-cent coin. On January 1, 1977, the Bicentennial designs were retired. The designs and dating procedures in use prior to the national celebration are now in force on all U.S. coins, including the 50 State Quarters and the Golden Dollar.