-16.53% is the change from 611 to 510
Calculation steps:
[( 510 - 611 ) ÷ 611] x 100 = -16.53%
Formula
Percentage change = [(510 - 611) / 611] x 100
Subtract the new number by the original number
510 - 611 = -101
-101 ÷ 611 = -0.16530278232405893
-0.16530278232405893 x 100 = -16.53%