-97.84% is the change from 972 to 21
Calculation steps:
[( 21 - 972 ) ÷ 972] x 100 = -97.84%
Formula
Percentage change = [(21 - 972) / 972] x 100
Subtract the new number by the original number
21 - 972 = -951
-951 ÷ 972 = -0.9783950617283951
-0.9783950617283951 x 100 = -97.84%