-15.64% is the change from 972 to 820
Calculation steps:
[( 820 - 972 ) ÷ 972] x 100 = -15.64%
Formula
Percentage change = [(820 - 972) / 972] x 100
Subtract the new number by the original number
820 - 972 = -152
-152 ÷ 972 = -0.15637860082304528
-0.15637860082304528 x 100 = -15.64%