-94.89% is the change from 666 to 34
Calculation steps:
[( 34 - 666 ) ÷ 666] x 100 = -94.89%
Formula
Percentage change = [(34 - 666) / 666] x 100
Subtract the new number by the original number
34 - 666 = -632
-632 ÷ 666 = -0.948948948948949
-0.948948948948949 x 100 = -94.89%