-69.57% is the change from 690 to 210
Calculation steps:
[( 210 - 690 ) ÷ 690] x 100 = -69.57%
Formula
Percentage change = [(210 - 690) / 690] x 100
Subtract the new number by the original number
210 - 690 = -480
-480 ÷ 690 = -0.6956521739130435
-0.6956521739130435 x 100 = -69.57%