-56.2% is the change from 959 to 420
Calculation steps:
[( 420 - 959 ) ÷ 959] x 100 = -56.2%
Formula
Percentage change = [(420 - 959) / 959] x 100
Subtract the new number by the original number
420 - 959 = -539
-539 ÷ 959 = -0.5620437956204379
-0.5620437956204379 x 100 = -56.2%