-68.24% is the change from 507 to 161
Calculation steps:
[( 161 - 507 ) ÷ 507] x 100 = -68.24%
Formula
Percentage change = [(161 - 507) / 507] x 100
Subtract the new number by the original number
161 - 507 = -346
-346 ÷ 507 = -0.6824457593688363
-0.6824457593688363 x 100 = -68.24%