-42.3% is the change from 688 to 397
Calculation steps:
[( 397 - 688 ) ÷ 688] x 100 = -42.3%
Formula
Percentage change = [(397 - 688) / 688] x 100
Subtract the new number by the original number
397 - 688 = -291
-291 ÷ 688 = -0.42296511627906974
-0.42296511627906974 x 100 = -42.3%