-71.21% is the change from 660 to 190
Calculation steps:
[( 190 - 660 ) ÷ 660] x 100 = -71.21%
Formula
Percentage change = [(190 - 660) / 660] x 100
Subtract the new number by the original number
190 - 660 = -470
-470 ÷ 660 = -0.7121212121212122
-0.7121212121212122 x 100 = -71.21%