-69.59% is the change from 217 to 66
Calculation steps:
[( 66 - 217 ) ÷ 217] x 100 = -69.59%
Formula
Percentage change = [(66 - 217) / 217] x 100
Subtract the new number by the original number
66 - 217 = -151
-151 ÷ 217 = -0.695852534562212
-0.695852534562212 x 100 = -69.59%