-72.74% is the change from 609 to 166
Calculation steps:
[( 166 - 609 ) ÷ 609] x 100 = -72.74%
Formula
Percentage change = [(166 - 609) / 609] x 100
Subtract the new number by the original number
166 - 609 = -443
-443 ÷ 609 = -0.7274220032840722
-0.7274220032840722 x 100 = -72.74%