-40.77% is the change from 856 to 507
Calculation steps:
[( 507 - 856 ) ÷ 856] x 100 = -40.77%
Formula
Percentage change = [(507 - 856) / 856] x 100
Subtract the new number by the original number
507 - 856 = -349
-349 ÷ 856 = -0.4077102803738318
-0.4077102803738318 x 100 = -40.77%