-2.17% is the change from 415 to 406
Calculation steps:
[( 406 - 415 ) ÷ 415] x 100 = -2.17%
Formula
Percentage change = [(406 - 415) / 415] x 100
Subtract the new number by the original number
406 - 415 = -9
-9 ÷ 415 = -0.021686746987951807
-0.021686746987951807 x 100 = -2.17%