Net immigration is down. That counts illegal immigration and deportations, presumably which are way down and way up, respectively. Both stats have nothing to do with how many people _want_ to be in the US, just how many people are able to get here.
How long is the of _applicants_ for residency in the US? That's the metric you're looking for. I suspect, with the increased difficulty in illegal immigration, that there is an increase in applications for legal immigration. That's speculation though, I have no idea where to get those numbers.
