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Table 4 Changes in the number of youth baseball teams, players, and players per team

From: Relative Age Effects in Male Japanese Professional Athletes: a 25-Year Historical Analysis

  Year Team (n) Player (n) Number of players per team (n)
Junior high school (rubber ball) 1994 8702
2001 8391 321,692 38.3
2010 8919 291,015 32.6
2018 8384 166,800 19.9
High school (hardball) 1994 4104 142,481 34.7
2001 4208 149,622 35.6
2010 4115 168,488 40.9
2018 3971 153,184 38.6
High school (rubber ball) 1994 627 14,373 22.9
2001 549 12,892 23.5
2010 482 11,014 22.9
2018 428 8755 20.5
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