-90.24% is the change from 666 to 65
Calculation steps:
[( 65 - 666 ) ÷ 666] x 100 = -90.24%
Formula
Percentage change = [(65 - 666) / 666] x 100
Subtract the new number by the original number
65 - 666 = -601
-601 ÷ 666 = -0.9024024024024024
-0.9024024024024024 x 100 = -90.24%