-15.91% is the change from 987 to 830
Calculation steps:
[( 830 - 987 ) ÷ 987] x 100 = -15.91%
Formula
Percentage change = [(830 - 987) / 987] x 100
Subtract the new number by the original number
830 - 987 = -157
-157 ÷ 987 = -0.1590678824721378
-0.1590678824721378 x 100 = -15.91%