-60.96% is the change from 643 to 251
Calculation steps:
[( 251 - 643 ) ÷ 643] x 100 = -60.96%
Formula
Percentage change = [(251 - 643) / 643] x 100
Subtract the new number by the original number
251 - 643 = -392
-392 ÷ 643 = -0.609642301710731
-0.609642301710731 x 100 = -60.96%