-70.52% is the change from 173 to 51
Calculation steps:
[( 51 - 173 ) ÷ 173] x 100 = -70.52%
Formula
Percentage change = [(51 - 173) / 173] x 100
Subtract the new number by the original number
51 - 173 = -122
-122 ÷ 173 = -0.7052023121387283
-0.7052023121387283 x 100 = -70.52%