-34.65% is the change from 101 to 66
Calculation steps:
[( 66 - 101 ) ÷ 101] x 100 = -34.65%
Formula
Percentage change = [(66 - 101) / 101] x 100
Subtract the new number by the original number
66 - 101 = -35
-35 ÷ 101 = -0.3465346534653465
-0.3465346534653465 x 100 = -34.65%