-66.14% is the change from 505 to 171
Calculation steps:
[( 171 - 505 ) ÷ 505] x 100 = -66.14%
Formula
Percentage change = [(171 - 505) / 505] x 100
Subtract the new number by the original number
171 - 505 = -334
-334 ÷ 505 = -0.6613861386138614
-0.6613861386138614 x 100 = -66.14%