-68.66% is the change from 670 to 210
Calculation steps:
[( 210 - 670 ) ÷ 670] x 100 = -68.66%
Formula
Percentage change = [(210 - 670) / 670] x 100
Subtract the new number by the original number
210 - 670 = -460
-460 ÷ 670 = -0.6865671641791045
-0.6865671641791045 x 100 = -68.66%