Judges who have served a term of four years and who retire in 1999 or 2000 shall receive an increase in their pension as follows. As noted above, judges retiring in 1999 shall receive an annual pension of 26,500 dollars. Their annual pension shall be increased to 31,000 dollars in 2000 and to 35,500 dollars in 2001. Judges retiring in 2000 shall receive an annual pension of 31,000 dollars. The pension shall be increased to 35,500 dollars in 2001;