-75.87% is the change from 688 to 166
Calculation steps:
[( 166 - 688 ) ÷ 688] x 100 = -75.87%
Formula
Percentage change = [(166 - 688) / 688] x 100
Subtract the new number by the original number
166 - 688 = -522
-522 ÷ 688 = -0.7587209302325582
-0.7587209302325582 x 100 = -75.87%