-51.98% is the change from 177 to 85
Calculation steps:
[( 85 - 177 ) ÷ 177] x 100 = -51.98%
Formula
Percentage change = [(85 - 177) / 177] x 100
Subtract the new number by the original number
85 - 177 = -92
-92 ÷ 177 = -0.519774011299435
-0.519774011299435 x 100 = -51.98%