Once again I will help you, as you once again forgot to double check the facts.
The NBA adopted the three-point line at the start of the 1979–80 season. This is of variable distance, ranging from 22 feet (6.7 m) in the corners to 23.75 feet (7.24 m) behind the top of the key. During the 1994–95, 1995–96, and 1996–97 seasons, the NBA attempted to address decreased scoring by shortening the overall distance of the line to a uniform 22 feet (6.7 m) around the basket. It was moved back to its original distance after the 1996–97 season.
Shorter line in three seasons. MJ was shooting 50%, 42.7% and 37.4% these seasons. After reseting the distance, his % dropped back to 23.8%.