Its for all entries or status you have had. For instance for me it would be 2 Trade Nafta's, 1 H-1B, Then I was in adjustment of status. They seem to be looking for you to show that you have been in some "status" the whole time you have been in the US.
So my stuff shows I renewed when I should have for the Trade Naftas, that I applied for my H-1B and was approved before my TN expired, then I showed that I applied for and my GC application was received before my H-1B expired. Hope this helps. I had submitted all I-94's I have held for the TN's and H-1B.