54.12% is the change from 643 to 991
Calculation steps:
[( 991 - 643 ) ÷ 643] x 100 = 54.12%
Formula
Percentage change = [(991 - 643) / 643] x 100
Subtract the new number by the original number
991 - 643 = 348
348 ÷ 643 = 0.5412130637636081
0.5412130637636081 x 100 = 54.12%