-75.38% is the change from 666 to 164
Calculation steps:
[( 164 - 666 ) ÷ 666] x 100 = -75.38%
Formula
Percentage change = [(164 - 666) / 666] x 100
Subtract the new number by the original number
164 - 666 = -502
-502 ÷ 666 = -0.7537537537537538
-0.7537537537537538 x 100 = -75.38%