-91.4% is the change from 593 to 51
Calculation steps:
[( 51 - 593 ) ÷ 593] x 100 = -91.4%
Formula
Percentage change = [(51 - 593) / 593] x 100
Subtract the new number by the original number
51 - 593 = -542
-542 ÷ 593 = -0.9139966273187183
-0.9139966273187183 x 100 = -91.4%