-75% is the change from 204 to 51
Calculation steps:
[( 51 - 204 ) ÷ 204] x 100 = -75%
Formula
Percentage change = [(51 - 204) / 204] x 100
Subtract the new number by the original number
51 - 204 = -153
-153 ÷ 204 = -0.75
-0.75 x 100 = -75%
Example