-89.98% is the change from 609 to 61
Calculation steps:
[( 61 - 609 ) ÷ 609] x 100 = -89.98%
Formula
Percentage change = [(61 - 609) / 609] x 100
Subtract the new number by the original number
61 - 609 = -548
-548 ÷ 609 = -0.8998357963875205
-0.8998357963875205 x 100 = -89.98%