19.94% is the change from 331 to 397
Calculation steps:
[( 397 - 331 ) ÷ 331] x 100 = 19.94%
Formula
Percentage change = [(397 - 331) / 331] x 100
Subtract the new number by the original number
397 - 331 = 66
66 ÷ 331 = 0.19939577039274925
0.19939577039274925 x 100 = 19.94%