-68.72% is the change from 211 to 66
Calculation steps:
[( 66 - 211 ) ÷ 211] x 100 = -68.72%
Formula
Percentage change = [(66 - 211) / 211] x 100
Subtract the new number by the original number
66 - 211 = -145
-145 ÷ 211 = -0.6872037914691943
-0.6872037914691943 x 100 = -68.72%