-75.71% is the change from 210 to 51
Calculation steps:
[( 51 - 210 ) ÷ 210] x 100 = -75.71%
Formula
Percentage change = [(51 - 210) / 210] x 100
Subtract the new number by the original number
51 - 210 = -159
-159 ÷ 210 = -0.7571428571428571
-0.7571428571428571 x 100 = -75.71%