-9.77% is the change from 215 to 194
Calculation steps:
[( 194 - 215 ) ÷ 215] x 100 = -9.77%
Formula
Percentage change = [(194 - 215) / 215] x 100
Subtract the new number by the original number
194 - 215 = -21
-21 ÷ 215 = -0.09767441860465116
-0.09767441860465116 x 100 = -9.77%