-91.77% is the change from 620 to 51
Calculation steps:
[( 51 - 620 ) ÷ 620] x 100 = -91.77%
Formula
Percentage change = [(51 - 620) / 620] x 100
Subtract the new number by the original number
51 - 620 = -569
-569 ÷ 620 = -0.917741935483871
-0.917741935483871 x 100 = -91.77%
Example