-66.46% is the change from 987 to 331
Calculation steps:
[( 331 - 987 ) ÷ 987] x 100 = -66.46%
Formula
Percentage change = [(331 - 987) / 987] x 100
Subtract the new number by the original number
331 - 987 = -656
-656 ÷ 987 = -0.6646403242147924
-0.6646403242147924 x 100 = -66.46%