-66.56% is the change from 634 to 212
Calculation steps:
[( 212 - 634 ) ÷ 634] x 100 = -66.56%
Formula
Percentage change = [(212 - 634) / 634] x 100
Subtract the new number by the original number
212 - 634 = -422
-422 ÷ 634 = -0.6656151419558359
-0.6656151419558359 x 100 = -66.56%