-77.03% is the change from 431 to 99
Calculation steps:
[( 99 - 431 ) ÷ 431] x 100 = -77.03%
Formula
Percentage change = [(99 - 431) / 431] x 100
Subtract the new number by the original number
99 - 431 = -332
-332 ÷ 431 = -0.7703016241299304
-0.7703016241299304 x 100 = -77.03%