53.41% is the change from 646 to 991
Calculation steps:
[( 991 - 646 ) ÷ 646] x 100 = 53.41%
Formula
Percentage change = [(991 - 646) / 646] x 100
Subtract the new number by the original number
991 - 646 = 345
345 ÷ 646 = 0.5340557275541795
0.5340557275541795 x 100 = 53.41%