Hi Sindhu,
You can have cumulative calculations without affecting filters by using LOD.
Syntax: { FIXED [FIELD_NAME] : AGGREGATION(FIELD) }
As per your question. we can find the average for all years.
{ FIXED : AVG([Sales]) }
similarly, profit as { FIXED : AVG([Profit]) }
Place the created field in sheet to see the avg sales year wise vs all years.
Hope it helps you.