-30.6% is the change from 487 to 338
Calculation steps:
[( 338 - 487 ) ÷ 487] x 100 = -30.6%
Formula
Percentage change = [(338 - 487) / 487] x 100
Subtract the new number by the original number
338 - 487 = -149
-149 ÷ 487 = -0.3059548254620123
-0.3059548254620123 x 100 = -30.6%