-75.6% is the change from 209 to 51
Calculation steps:
[( 51 - 209 ) ÷ 209] x 100 = -75.6%
Formula
Percentage change = [(51 - 209) / 209] x 100
Subtract the new number by the original number
51 - 209 = -158
-158 ÷ 209 = -0.7559808612440191
-0.7559808612440191 x 100 = -75.6%