-75.52% is the change from 678 to 166
Calculation steps:
[( 166 - 678 ) ÷ 678] x 100 = -75.52%
Formula
Percentage change = [(166 - 678) / 678] x 100
Subtract the new number by the original number
166 - 678 = -512
-512 ÷ 678 = -0.7551622418879056
-0.7551622418879056 x 100 = -75.52%