-33.13% is the change from 987 to 660
Calculation steps:
[( 660 - 987 ) ÷ 987] x 100 = -33.13%
Formula
Percentage change = [(660 - 987) / 987] x 100
Subtract the new number by the original number
660 - 987 = -327
-327 ÷ 987 = -0.331306990881459
-0.331306990881459 x 100 = -33.13%