-34.9% is the change from 997 to 649
Calculation steps:
[( 649 - 997 ) ÷ 997] x 100 = -34.9%
Formula
Percentage change = [(649 - 997) / 997] x 100
Subtract the new number by the original number
649 - 997 = -348
-348 ÷ 997 = -0.34904714142427284
-0.34904714142427284 x 100 = -34.9%