-80.98% is the change from 347 to 66
Calculation steps:
[( 66 - 347 ) ÷ 347] x 100 = -80.98%
Formula
Percentage change = [(66 - 347) / 347] x 100
Subtract the new number by the original number
66 - 347 = -281
-281 ÷ 347 = -0.8097982708933718
-0.8097982708933718 x 100 = -80.98%