WHERE SOLARWINDS KEEP AVAILABILITY INFORMATION FROM AVAILABILITY STATISTICS DASHBOARD?

I think you will find it in the Orion.ResponseTime within SWQL, not sure in SQL. 

 LeBeauUK  is right.

You could use this as a starter SWQL query.

SELECT TOP 1000
     rt.DateTime
    ,rt.NodeID
    ,rt.Availability
FROM Orion.ResponseTime AS rt
ORDER BY rt.DateTime DESC

Though I must say - I always aim for 100% uptime... but you my friend giovana.prado have achieved 100,000% uptime. Kudos to your hard work! 

All kidding aside, if that's why you're posting this, looks like some conversion issue in the web ui with that widget potentially.

Don't some languages use the comma as the decimal separator?

I believe you need to have the squiggly brackets in the formatting on the table. {0.00%} If memory serves me correctly

I believe you need to have the squiggly brackets in the formatting on the table. {0.00%} If memory serves me correctly