-77.19% is the change from 434 to 99
Calculation steps:
[( 99 - 434 ) ÷ 434] x 100 = -77.19%
Formula
Percentage change = [(99 - 434) / 434] x 100
Subtract the new number by the original number
99 - 434 = -335
-335 ÷ 434 = -0.771889400921659
-0.771889400921659 x 100 = -77.19%