You can see the restriction easily on a chart: https://www.migrationpolicy.org/programs/data-hub/charts/ann...
We have been around 1 million per year for decades. If we still had that policy, adjusted for population you’re talking about cutting legal immigration by one-third to one-half.
And that’s not counting a large increase in “gray market” legal immigration (TPS, asylum, etc.)
Source: DHS Yearbook, https://ohss.dhs.gov/topics/immigration/yearbook/2019/table1...