-90.38% is the change from 634 to 61
Calculation steps:
[( 61 - 634 ) ÷ 634] x 100 = -90.38%
Formula
Percentage change = [(61 - 634) / 634] x 100
Subtract the new number by the original number
61 - 634 = -573
-573 ÷ 634 = -0.9037854889589906
-0.9037854889589906 x 100 = -90.38%