-73.49% is the change from 811 to 215
Calculation steps:
[( 215 - 811 ) ÷ 811] x 100 = -73.49%
Formula
Percentage change = [(215 - 811) / 811] x 100
Subtract the new number by the original number
215 - 811 = -596
-596 ÷ 811 = -0.7348951911220715
-0.7348951911220715 x 100 = -73.49%