-69.17% is the change from 678 to 209
Calculation steps:
[( 209 - 678 ) ÷ 678] x 100 = -69.17%
Formula
Percentage change = [(209 - 678) / 678] x 100
Subtract the new number by the original number
209 - 678 = -469
-469 ÷ 678 = -0.6917404129793511
-0.6917404129793511 x 100 = -69.17%