50.15% is the change from 664 to 997
Calculation steps:
[( 997 - 664 ) ÷ 664] x 100 = 50.15%
Formula
Percentage change = [(997 - 664) / 664] x 100
Subtract the new number by the original number
997 - 664 = 333
333 ÷ 664 = 0.5015060240963856
0.5015060240963856 x 100 = 50.15%