-96.3% is the change from 487 to 18
Calculation steps:
[( 18 - 487 ) ÷ 487] x 100 = -96.3%
Formula
Percentage change = [(18 - 487) / 487] x 100
Subtract the new number by the original number
18 - 487 = -469
-469 ÷ 487 = -0.9630390143737166
-0.9630390143737166 x 100 = -96.3%