-70.15% is the change from 670 to 200
Calculation steps:
[( 200 - 670 ) ÷ 670] x 100 = -70.15%
Formula
Percentage change = [(200 - 670) / 670] x 100
Subtract the new number by the original number
200 - 670 = -470
-470 ÷ 670 = -0.7014925373134329
-0.7014925373134329 x 100 = -70.15%