-80.42% is the change from 337 to 66
Calculation steps:
[( 66 - 337 ) ÷ 337] x 100 = -80.42%
Formula
Percentage change = [(66 - 337) / 337] x 100
Subtract the new number by the original number
66 - 337 = -271
-271 ÷ 337 = -0.8041543026706232
-0.8041543026706232 x 100 = -80.42%