April 18 (UPI) -- New data shows dramatic changes in ethic makeup experienced by Major League Baseball over a 50-year time period. The data follows the celebration of Jackie Robinson Day. Professional baseball players sported No. 42 on their jerseys to honor Robinson on Monday, after he broke baseball's color barrier in 1947 as the first African American player in the game. Advertisement The Hall of Famer went on to play for 10 seasons, wrapping up his career with a .311 batting average, 137