-30.6% is the change from 634 to 440
Calculation steps:
[( 440 - 634 ) ÷ 634] x 100 = -30.6%
Formula
Percentage change = [(440 - 634) / 634] x 100
Subtract the new number by the original number
440 - 634 = -194
-194 ÷ 634 = -0.305993690851735
-0.305993690851735 x 100 = -30.6%