Congressional compensation – 1992
“No law varying the compensation for the services of the Senators and Representatives shall take effect, until an election of Representatives shall have intervened.”
Side note: Twelve amendments were sent to the states for ratification in 1791, only 10 were ratified by the states and they became the Bill of Rights. One that was rejected by the states was that Congress should not be allowed to give itself pay raises without constituents being able to register their disapproval. 201 years later it, in essence, became the 27th Amendment to the Constitution.
See: Previous Amendment (Twenty-Sixth Amendment)