Mark Aguirre led the 1982–83 Mavericks with 24.4 points per game, finishing sixth in the NBA. Jay Vincent and Rolando Blackman contributed 18.7 and 17.7 points per game, respectively. Brad Davis was 10th in the NBA in assists with 7.2 per game, and shot .845 from the free-throw line, 6th in the league. Derek Harper was drafted by the Mavs with the 11th pick of the 1983 NBA draft. The 6 ft 4 in guard would spend the next decade with the organization, averaging 15 points and 6.1 assists. The Mavericks in 1983–84 NBA season posted a winning record for the first time in franchise history, finishing 43–39 and second in the Midwest Division. The Mavs also earned the first playoff berth in franchise history. Mark Aguirre was named the teams first NBA All-Star, as he finished with an average of 29.5 points per game—second in the league to Utahs Adrian Dantley.
Question: How many years did Derek Harper play for the Mavericks?
Answer: 10