-56.6% is the change from 970 to 421
Calculation steps:
[( 421 - 970 ) ÷ 970] x 100 = -56.6%
Formula
Percentage change = [(421 - 970) / 970] x 100
Subtract the new number by the original number
421 - 970 = -549
-549 ÷ 970 = -0.565979381443299
-0.565979381443299 x 100 = -56.6%