-76.61% is the change from 218 to 51
Calculation steps:
[( 51 - 218 ) ÷ 218] x 100 = -76.61%
Formula
Percentage change = [(51 - 218) / 218] x 100
Subtract the new number by the original number
51 - 218 = -167
-167 ÷ 218 = -0.7660550458715596
-0.7660550458715596 x 100 = -76.61%