Task: Question Answering
Input (English): Passage: The NBA had a salary cap in the mid-1940s, but it was abolished after only one season. The league continued to operate without such a cap until 1984-85 NBA season, when one was instituted in an attempt to level the playing field among all of the NBAs teams and ensure competitive balance for the Association in the future. Before the cap was reinstated, teams could spend whatever amount of money they wanted on players, but in the first season under the new cap, they were each limited to $3.6 million in total payroll. Under the 2005 NBA collective bargaining agreement, salaries were capped at 57 percent of basketball-related income (BRI) and lasted for six years until June 30, 2011. The next CBA, which took effect in 2011-12, set the cap at 51.2 percent of BRI in 2011-12, with a 49-to-51 band in subsequent years. The salary cap for  was set at $94.14 million, with the salary floor at 84.73 million and the luxury tax limit at $113.29 million. The current CBA took effect with the 2017-18 season. 
Question: How many decades between the 1940s and the 1980s had no salary cap at all during any year? 
Answer type: Number 
Output (English): 3.