-71.06% is the change from 660 to 191
Calculation steps:
[( 191 - 660 ) ÷ 660] x 100 = -71.06%
Formula
Percentage change = [(191 - 660) / 660] x 100
Subtract the new number by the original number
191 - 660 = -469
-469 ÷ 660 = -0.7106060606060606
-0.7106060606060606 x 100 = -71.06%