It seems that you are looking for the percent change of the given numbers above. Hope this helps.
old number−new number
Percent Change = ____________________ x 100
old number
Percent Change = 37 - 17/ 37 x 100
Percent Change = 20/37 x 100
Percent Change = 0.54 x 100
Percent Change = 54%
Hope this answers your question. Have a great day!