Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: The relevant sentence in the passage is: Malone led the NBA in rebounding six times, including a then-record five straight seasons (1981 -- 1985).
The question and answer:
Malone led the NBA in rebounding six times, including a then-record five straight seasons (1981 -- 1985). He finished his career as the all-time leader in offensive rebounds after leading both the ABA and NBA in the category a combined nine times. Malone was nicknamed "Chairman of the Boards" for his rebounding prowess. Combining his ABA and NBA statistics, he ranks seventh all-time in career points (29,580) and third in total rebounds (17,834). He was named to both the ABA All-Time Team and the NBA's 50th Anniversary All-Time Team.

How many years did moses malone lead the league in rebounds?
The answer is six