-83.72% is the change from 608 to 99
Calculation steps:
[( 99 - 608 ) ÷ 608] x 100 = -83.72%
Formula
Percentage change = [(99 - 608) / 608] x 100
Subtract the new number by the original number
99 - 608 = -509
-509 ÷ 608 = -0.837171052631579
-0.837171052631579 x 100 = -83.72%