-50.8% is the change from 817 to 402
Calculation steps:
[( 402 - 817 ) ÷ 817] x 100 = -50.8%
Formula
Percentage change = [(402 - 817) / 817] x 100
Subtract the new number by the original number
402 - 817 = -415
-415 ÷ 817 = -0.5079559363525091
-0.5079559363525091 x 100 = -50.8%