I would like to change to 10% deviation from standard for below query

[paragg]

index="xyz" sourcetype = abc"
| search Country="ggg"  statusCode=200
| stats count as Registration
| where Registration =0

Could you please help me to modify this query. Time period is last 24 hours. 

[ITWhisperer]

Your requirement is unclear and imprecise - what is "standard"? what are you trying to establish the deviation of? your current search will only return results when there are no events, so you have no events to establish any deviation from standard anyway!

Please clarify