Who was the nba rookie of the year last year?
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Who was the nba rookie of the year in the 2016-2017 season?
Malcolm Brogdon Brogdon
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Who was the nba rookie of the year in the 2015-2016 season?
Karl-Anthony Towns Towns
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Who was the nba rookie of the year in the 2014-2015 season?
Andrew Wiggins Wiggins
NBA Rookie of the Year Award
https://en.wikipedia.org/wiki/NBA%20Rookie%20of%20the%20Year%20Award
The National Basketball Association's Rookie of the Year Award is an annual National Basketball Association (NBA) award given to the top rookie(s) of the regular season. 
NBA Rookie of the Year Award
The winner is selected by a panel of United States and Canadian sportswriters and broadcasters,[1] each casting first-, second-, and third-place votes (worth five points, three points, and one point, respectively). The player(s) with the highest point total, regardless of the number of first-place votes, wins the award.[2]
NBA Rookie of the Year Award
The National Basketball Association's Rookie of the Year Award is an annual award given to the top rookie's of the regular season. The winner is selected by a panel of United States and Canadian sportswriters and broadcasters, each casting first, second, and third place votes, the player or players, with the highest point total, regardless of the number of first place votes, wins the award. In the 2014-2015 season, Andrew Wiggins was rookie of the year, 2015-2017 Karl-Anthony Towns, and  the 2016-2017 Malcolm Brogdon. 