-71.92% is the change from 609 to 171
Calculation steps:
[( 171 - 609 ) ÷ 609] x 100 = -71.92%
Formula
Percentage change = [(171 - 609) / 609] x 100
Subtract the new number by the original number
171 - 609 = -438
-438 ÷ 609 = -0.7192118226600985
-0.7192118226600985 x 100 = -71.92%