-2.3% is the change from 217 to 212
Calculation steps:
[( 212 - 217 ) ÷ 217] x 100 = -2.3%
Formula
Percentage change = [(212 - 217) / 217] x 100
Subtract the new number by the original number
212 - 217 = -5
-5 ÷ 217 = -0.02304147465437788
-0.02304147465437788 x 100 = -2.3%