-17.02% is the change from 611 to 507
Calculation steps:
[( 507 - 611 ) ÷ 611] x 100 = -17.02%
Formula
Percentage change = [(507 - 611) / 611] x 100
Subtract the new number by the original number
507 - 611 = -104
-104 ÷ 611 = -0.1702127659574468
-0.1702127659574468 x 100 = -17.02%