23788
A second study in the same journal finds that injuries among Rugby Union players have nearly doubled since the sport became professional five years ago , from 27 % to 47 % .
 second, Rugby Union, five years ago, 27 %, 47 %
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 second, Rugby Union, five years ago, 27 %, 47 %