-71.3% is the change from 345 to 99
Calculation steps:
[( 99 - 345 ) ÷ 345] x 100 = -71.3%
Formula
Percentage change = [(99 - 345) / 345] x 100
Subtract the new number by the original number
99 - 345 = -246
-246 ÷ 345 = -0.7130434782608696
-0.7130434782608696 x 100 = -71.3%