-75.62% is the change from 406 to 99
Calculation steps:
[( 99 - 406 ) ÷ 406] x 100 = -75.62%
Formula
Percentage change = [(99 - 406) / 406] x 100
Subtract the new number by the original number
99 - 406 = -307
-307 ÷ 406 = -0.7561576354679803
-0.7561576354679803 x 100 = -75.62%