-67.93% is the change from 661 to 212
Calculation steps:
[( 212 - 661 ) ÷ 661] x 100 = -67.93%
Formula
Percentage change = [(212 - 661) / 661] x 100
Subtract the new number by the original number
212 - 661 = -449
-449 ÷ 661 = -0.6792738275340393
-0.6792738275340393 x 100 = -67.93%