-34.12% is the change from 976 to 643
Calculation steps:
[( 643 - 976 ) ÷ 976] x 100 = -34.12%
Formula
Percentage change = [(643 - 976) / 976] x 100
Subtract the new number by the original number
643 - 976 = -333
-333 ÷ 976 = -0.3411885245901639
-0.3411885245901639 x 100 = -34.12%