-80.47% is the change from 338 to 66
Calculation steps:
[( 66 - 338 ) ÷ 338] x 100 = -80.47%
Formula
Percentage change = [(66 - 338) / 338] x 100
Subtract the new number by the original number
66 - 338 = -272
-272 ÷ 338 = -0.8047337278106509
-0.8047337278106509 x 100 = -80.47%