Congress is required by Article I, Section 6, of the Constitution to determine its own pay. Prior to 1969, Congress did so by enacting specific legislation. From 1789 through 1968, Congress raised its pay 22 times using this procedure. Members were initially paid per diem. The first annual salaries, in 1815, were $1,500. Per diem pay was reinstituted in 1817. Congress returned to annual salaries, at a rate of $3,000, in 1855. By 1968, pay had risen to $30,000. Specific legislation may still be used to raise Member pay, as it was most recently in 1982, 1983, 1989, and 1991; but two other methods--including an automatic annual adjustment procedure and a commission process--are now also available. The Ethics Reform Act of 1989 established the current formula for automatic annual adjustments, which is based on changes in private sector wages and salaries as measured by the Employment Cost Index. The adjustment goes into effect automatically unless denied statutorily by Congress, although the percentage may not exceed the percentage base pay increase for General Schedule (GS) employees. Members of Congress last received a pay adjustment in January 2009. At that time, their salary was increased 2.8%, to $174,000 from $169,300. A provision ...