-35.41% is the change from 997 to 644
Calculation steps:
[( 644 - 997 ) ÷ 997] x 100 = -35.41%
Formula
Percentage change = [(644 - 997) / 997] x 100
Subtract the new number by the original number
644 - 997 = -353
-353 ÷ 997 = -0.354062186559679
-0.354062186559679 x 100 = -35.41%