50.83% is the change from 661 to 997
Calculation steps:
[( 997 - 661 ) ÷ 661] x 100 = 50.83%
Formula
Percentage change = [(997 - 661) / 661] x 100
Subtract the new number by the original number
997 - 661 = 336
336 ÷ 661 = 0.5083207261724659
0.5083207261724659 x 100 = 50.83%