-68.42% is the change from 209 to 66
Calculation steps:
[( 66 - 209 ) ÷ 209] x 100 = -68.42%
Formula
Percentage change = [(66 - 209) / 209] x 100
Subtract the new number by the original number
66 - 209 = -143
-143 ÷ 209 = -0.6842105263157895
-0.6842105263157895 x 100 = -68.42%