-83.25% is the change from 609 to 102
Calculation steps:
[( 102 - 609 ) ÷ 609] x 100 = -83.25%
Formula
Percentage change = [(102 - 609) / 609] x 100
Subtract the new number by the original number
102 - 609 = -507
-507 ÷ 609 = -0.8325123152709359
-0.8325123152709359 x 100 = -83.25%