-10.7% is the change from 215 to 192
Calculation steps:
[( 192 - 215 ) ÷ 215] x 100 = -10.7%
Formula
Percentage change = [(192 - 215) / 215] x 100
Subtract the new number by the original number
192 - 215 = -23
-23 ÷ 215 = -0.10697674418604651
-0.10697674418604651 x 100 = -10.7%