-9.8% is the change from 51 to 46
Calculation steps:
[( 46 - 51 ) ÷ 51] x 100 = -9.8%
Formula
Percentage change = [(46 - 51) / 51] x 100
Subtract the new number by the original number
46 - 51 = -5
-5 ÷ 51 = -0.09803921568627451
-0.09803921568627451 x 100 = -9.8%