[zeestephen]

I believe your number may not include workers who leave the USA workforce when their visas expire.

Many people at Free Republic support high levels of immigration - but not me.

They often challenge my numbers as being too high.

So, I use the most conservative numbers I can find.

[kabar]

These figures as explained by Roy Beck, NumbersUSA, are new work permits issued annually and then divided by 12 to give the monthly figure. About 400,000 are adult green card holders, i.e., legal permanent residents.

Here is a video of Roy explaining how the numbers are arrived at