-83.91% is the change from 609 to 98
Calculation steps:
[( 98 - 609 ) ÷ 609] x 100 = -83.91%
Formula
Percentage change = [(98 - 609) / 609] x 100
Subtract the new number by the original number
98 - 609 = -511
-511 ÷ 609 = -0.8390804597701149
-0.8390804597701149 x 100 = -83.91%