-68.47% is the change from 666 to 210
Calculation steps:
[( 210 - 666 ) ÷ 666] x 100 = -68.47%
Formula
Percentage change = [(210 - 666) / 666] x 100
Subtract the new number by the original number
210 - 666 = -456
-456 ÷ 666 = -0.6846846846846847
-0.6846846846846847 x 100 = -68.47%