-74.6% is the change from 815 to 207
Calculation steps:
[( 207 - 815 ) ÷ 815] x 100 = -74.6%
Formula
Percentage change = [(207 - 815) / 815] x 100
Subtract the new number by the original number
207 - 815 = -608
-608 ÷ 815 = -0.7460122699386503
-0.7460122699386503 x 100 = -74.6%