-34.16% is the change from 647 to 426
Calculation steps:
[( 426 - 647 ) ÷ 647] x 100 = -34.16%
Formula
Percentage change = [(426 - 647) / 647] x 100
Subtract the new number by the original number
426 - 647 = -221
-221 ÷ 647 = -0.3415765069551777
-0.3415765069551777 x 100 = -34.16%