-68.03% is the change from 660 to 211
Calculation steps:
[( 211 - 660 ) ÷ 660] x 100 = -68.03%
Formula
Percentage change = [(211 - 660) / 660] x 100
Subtract the new number by the original number
211 - 660 = -449
-449 ÷ 660 = -0.6803030303030303
-0.6803030303030303 x 100 = -68.03%