-5.05% is the change from 970 to 921
Calculation steps:
[( 921 - 970 ) ÷ 970] x 100 = -5.05%
Formula
Percentage change = [(921 - 970) / 970] x 100
Subtract the new number by the original number
921 - 970 = -49
-49 ÷ 970 = -0.050515463917525774
-0.050515463917525774 x 100 = -5.05%