In 2000, the president's term was increased to seven years.

Later, the tribe increased the terms of office to four years.

The measure would have increased the length of terms from two to four years.

By 1980, the figure had increased to 11.1 years, nearly the same as the average for whites.

By 1929 the minimum had been increased to six years.

By 2020, the payment period would be increased to 42 years.

By the 1970s this time period had increased to five years.

In 1997, the age restriction was increased to 18 years.

Since 1968, the time limit has increased to 50 years.

Beginning with the 1962 election, the term of the office increased from two to four years.