-45.1% is the change from 949 to 521
Calculation steps:
[( 521 - 949 ) ÷ 949] x 100 = -45.1%
Formula
Percentage change = [(521 - 949) / 949] x 100
Subtract the new number by the original number
521 - 949 = -428
-428 ÷ 949 = -0.45100105374077976
-0.45100105374077976 x 100 = -45.1%