-4.68% is the change from 641 to 611
Calculation steps:
[( 611 - 641 ) ÷ 641] x 100 = -4.68%
Formula
Percentage change = [(611 - 641) / 641] x 100
Subtract the new number by the original number
611 - 641 = -30
-30 ÷ 641 = -0.046801872074883
-0.046801872074883 x 100 = -4.68%