As I noted earlier, it is a continual challenge in terms of how we manage this program, between the volumes we face and the need for timely decisions. We're very cognizant of the importance of those timely decisions versus the time it takes us to do it right.
As I've said, for a simple, easy case, we can do it in a matter of days. More complex cases are going to take more time. They may be more complex because we're missing information. They may be more complex in terms of where somebody's coming from. It may be because we're waiting for information from partners and we don't have any control over that.
That doesn't mean we don't strive constantly to improve our level of efficiency. I've seen significant improvements in our productivity over the last two to three years, but as I've noted, our volumes have gone up as well. The improvements we've made in productivity have been outstripped by the increase in volume. We had about 50,000 people in our inventory three to four years ago, and we have about 195,000 in our inventory now. What I'd say is that about half of those are in-Canada asylum claimants, so bear in mind that they are here in the country. The other half will be TRV and other visa applicants.
We get a portion of that. The very first step is taking that risk-based approach and allowing IRCC decision-makers, based on our thematic indicators, to make a decision on whether or not security screening is required. If it does come to us, we do need to take the time to do it right.
I apologize if I'm repeating myself, but we are looking at, for those in-Canada asylum claimants, how we can do a better job at more rapidly moving through those cases. We'll probably move from a first-in, first-out process to identifying simple, easy, less complex cases that allow us to clear them out of the inventory more quickly. That's going to do two things. That's going to provide quicker decisions for some people, but then it will free up resources to work on the inventory as a whole and will address some of those visa applications as well.