-84.11% is the change from 623 to 99
Calculation steps:
[( 99 - 623 ) ÷ 623] x 100 = -84.11%
Formula
Percentage change = [(99 - 623) / 623] x 100
Subtract the new number by the original number
99 - 623 = -524
-524 ÷ 623 = -0.841091492776886
-0.841091492776886 x 100 = -84.11%