-92.09% is the change from 215 to 17
Calculation steps:
[( 17 - 215 ) ÷ 215] x 100 = -92.09%
Formula
Percentage change = [(17 - 215) / 215] x 100
Subtract the new number by the original number
17 - 215 = -198
-198 ÷ 215 = -0.9209302325581395
-0.9209302325581395 x 100 = -92.09%