-60.47% is the change from 129 to 51
Calculation steps:
[( 51 - 129 ) ÷ 129] x 100 = -60.47%
Formula
Percentage change = [(51 - 129) / 129] x 100
Subtract the new number by the original number
51 - 129 = -78
-78 ÷ 129 = -0.6046511627906976
-0.6046511627906976 x 100 = -60.47%