-80.91% is the change from 634 to 121
Calculation steps:
[( 121 - 634 ) ÷ 634] x 100 = -80.91%
Formula
Percentage change = [(121 - 634) / 634] x 100
Subtract the new number by the original number
121 - 634 = -513
-513 ÷ 634 = -0.8091482649842271
-0.8091482649842271 x 100 = -80.91%