-72.09% is the change from 609 to 170
Calculation steps:
[( 170 - 609 ) ÷ 609] x 100 = -72.09%
Formula
Percentage change = [(170 - 609) / 609] x 100
Subtract the new number by the original number
170 - 609 = -439
-439 ÷ 609 = -0.7208538587848933
-0.7208538587848933 x 100 = -72.09%