-50.6% is the change from 994 to 491
Calculation steps:
[( 491 - 994 ) ÷ 994] x 100 = -50.6%
Formula
Percentage change = [(491 - 994) / 994] x 100
Subtract the new number by the original number
491 - 994 = -503
-503 ÷ 994 = -0.506036217303823
-0.506036217303823 x 100 = -50.6%