-68.51% is the change from 670 to 211
Calculation steps:
[( 211 - 670 ) ÷ 670] x 100 = -68.51%
Formula
Percentage change = [(211 - 670) / 670] x 100
Subtract the new number by the original number
211 - 670 = -459
-459 ÷ 670 = -0.6850746268656717
-0.6850746268656717 x 100 = -68.51%