-34.51% is the change from 991 to 649
Calculation steps:
[( 649 - 991 ) ÷ 991] x 100 = -34.51%
Formula
Percentage change = [(649 - 991) / 991] x 100
Subtract the new number by the original number
649 - 991 = -342
-342 ÷ 991 = -0.34510595358224017
-0.34510595358224017 x 100 = -34.51%