-50.63% is the change from 399 to 197
Calculation steps:
[( 197 - 399 ) ÷ 399] x 100 = -50.63%
Formula
Percentage change = [(197 - 399) / 399] x 100
Subtract the new number by the original number
197 - 399 = -202
-202 ÷ 399 = -0.506265664160401
-0.506265664160401 x 100 = -50.63%