-71.49% is the change from 670 to 191
Calculation steps:
[( 191 - 670 ) ÷ 670] x 100 = -71.49%
Formula
Percentage change = [(191 - 670) / 670] x 100
Subtract the new number by the original number
191 - 670 = -479
-479 ÷ 670 = -0.7149253731343284
-0.7149253731343284 x 100 = -71.49%