-91.64% is the change from 610 to 51
Calculation steps:
[( 51 - 610 ) ÷ 610] x 100 = -91.64%
Formula
Percentage change = [(51 - 610) / 610] x 100
Subtract the new number by the original number
51 - 610 = -559
-559 ÷ 610 = -0.9163934426229509
-0.9163934426229509 x 100 = -91.64%