how many days does events table data store in Solarwinds database?

we need to create report for specific date around 3 month ago, but I use the query and see that there is no event data for two month ago

I checked the Events Table by this:

SELECT *
  FROM [NetPerfMon].[dbo].[Events]

and the result is just the for last 2 month!!!

I want to know is solarwinds just store 2 month data?? and how delete this data? and how can I (if I want) stop this?