-60.3% is the change from 670 to 266
Calculation steps:
[( 266 - 670 ) ÷ 670] x 100 = -60.3%
Formula
Percentage change = [(266 - 670) / 670] x 100
Subtract the new number by the original number
266 - 670 = -404
-404 ÷ 670 = -0.6029850746268657
-0.6029850746268657 x 100 = -60.3%