-91.9% is the change from 642 to 52
Calculation steps:
[( 52 - 642 ) ÷ 642] x 100 = -91.9%
Formula
Percentage change = [(52 - 642) / 642] x 100
Subtract the new number by the original number
52 - 642 = -590
-590 ÷ 642 = -0.9190031152647975
-0.9190031152647975 x 100 = -91.9%