Over 500,000 of those are familial green cards (spouses and children), meaning they likely would have been issued regardless of the changes in policy and don't really reflect a multicultural dimension for the country.
Other permanent resident status issuances take up to 15 years to achieve, meaning you won't see the effects of recent policy changes in that metric until the years to come.
That depends a lot what exactly visas are those. There are dual intent visas, which allow change to permanent immigrant status, and ones that explicitly prohibit such change. Most visas at your link are B type visas, which would be denied if immigration officer even suspects you have intent to become a permanent resident.
Other permanent resident status issuances take up to 15 years to achieve, meaning you won't see the effects of recent policy changes in that metric until the years to come.
A better metric is visa issuances, since those are the first step for many to becoming a legal permanent resident. Those have peaked in 2015 and have declined back to 2013 levels now: https://travel.state.gov/content/dam/visas/Statistics/Annual...