Some numbers to document how this League grows, might also be interesting to compare it to other leagues. Feel free to add any other numbers you like.

At the start of Season 6:

Stadium Level (number of clubs)
0 X
1 XX
2 XXXXXX
3 XXXXXXX
Average: 2.19

Training Complex (number of clubs)
0 X
1
2 XXXX
3 XX
4 XX
5 XXXXXX
6 X
Average: 3.63

Youth Center (number of clubs)
0 X
1 XX
2
3 XX
4 XXXXX
5 XXXX
6 XX
Average: 3.75

Bot Teams: 3

Average Popularity: 111,640

I'm definitely in the upper echelon of these statistics....

Stadium Lvl 3
Training level 5
Youth level 6

Popularity 185,699

This is a really great chart! I wouldn't be surprised if a lot of teams upgraded their facilities around this time of the season though.

Ah, this is applied for League 2 only. I was confused for a little bit :)
But great work!

These things are constantly changing, but this is a snapshot. I also did this summary for League 1, check their forum if you're interested in a comparison. And sorry, I like numbers (which is why I play this spreadsheet of a game) so here's one more bit of info about our League:

Manager experience at the beginning of Season 6, not rounded just number of months completed.

Months of Experience (number of managers)
0 XXX
1 XX
2
3 X
4 X
5 XXX
6 XX
7
8 XX
Average: 3.71

At the half-way point of Season 6:

Stadium Level (number of clubs)
0 XX
1 XX
2 XXX
3 XXXXXXXX
4 X
Average: 2.25 (2.19 - at the start of the season)

Training Complex (number of clubs)
0 XX
1
2 XXX
3
4 XXXX
5 XXXX
6 XXX
Average: 3.75 (3.63)

Youth Center (number of clubs)
0 XXXX
1 X
2
3 X
4 XXXX
5 XXX
6 XXXX
Average: 3.69 (3.75)

Bot Teams: 3 (3)

Average Popularity: 125,156 (111,640)

Months of Experience (number of managers, excluding bots)
0 XX
1
2 XX
3 X
4
5 XX
6 XXX
7 X
8
9 XX
Average: 4.62 (3.71)

Some notes on the first half of Season 6:
Due to teams going bot there is 1 additional team with Level 0 Stadium and Training, and 3 additional teams with Level 0 Youth. That skews the averages down and results in little change in the averages.
The league got 1 additional Level 3 Stadium and the first Level 4 Stadium (congrats Akron). There are 2 new Level 6 Training Complexes and Youth Centers.
Popularity didn't increase too much, again this is probably because of teams going bot.
On a personal note, I went to a Level 3 Stadium, just like most of the League, so I'm at least keeping up there. However, my Level 4 Training and Youth are on the low end of the spectrum. That might have something to do with my whopping 2 (nearly 3) months of experience being way on the low end of that scale. My popularity is above average, which will definitely help going forward.