MLS Teams Playing Under 21's

Here's a table that shows % of minutes played and the count of players under 21 years of age. I've also added each team's Points Per Game.

Mins	Team	# < 21	PPG
23%	FC Dallas	6	1.09
19%	NY Red Bulls	5	1.10
16%	LA Galaxy	4	1.64
16%	Atlanta Utd	6	1.23
13%	Philadelphia	6	1.39
11%	Colorado Rapids	5	1.95
10%	Sporting KC	4	1.74
10%	Los Angeles FC	4	1.23
9%	D.C. United	3	1.36
8%	Seattle	6	1.91
7%	Orlando City	2	1.73
6%	NYCFC	4	1.62
6%	San Jose	1	1.18
5%	Real Salt Lake	1	1.36
4%	Chicago Fire	2	1.05
3%	Toronto FC	1	0.68
2%	CF Montréal	1	1.41
2%	Austin FC	1	0.86
1%	Inter Miami	1	1.24
0%	New England	1	2.17
0%	Minnesota Utd	1	1.48
0%	Nashville	0	1.73
0%	Portland Timbers	0	1.36
0%	Vancouver	0	1.32
0%	Columbus Crew	0	1.17
0%	Houston Dynamo	0	0.83
0%	FC Cincinnati	0	0.81

Source: Football Reference and me.