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Approximate number of amendment proposals formally introduced by members of Congress between 1789 and 1998: Over 10,000
Number of amendments officially proposed by Congress between 1789 and 1998: 33
Number of amendments ratified by states between 1789 and 1998: 27
Number of states normally needed to ratify an amendment to the Constitution (since 1948): 38
Number of states needed to ratify an amendment which would end the equal representation of each state in the Senate: 50
Number of state legislatures that requested Congress to call a convention to propose an amendment to overturn the decision of Reynolds v. Sims (1964) (in which the Supreme Court ruled that both chambers of state legislatures must be apportioned by population) by 1967: 33 (34 needed)
Number of state legislatures that had requested that Congress call a convention to propose a balanced budget amendment by 1995: 32 (34 needed)
Shortest time between proposal and ratification of an amendment: 4 months (Amendment 26)
Longest time between proposal and ratification of an amendment: 202 years, 7 +AL0- months (Amendment 27)
Average time between proposal
and ratification for all amendments except Amendment 27: 1 year, 8 months
