Where is 4-2-3-1 the default?

Share of line-ups set out as 4-2-3-1 — the most common shape in football, and in some leagues close to the only one.

Serie B (Brazil) is the most uniform: 70% of its line-ups are 4-2-3-1.

Where is 4-2-3-1 the default?
League	4-2-3-1	Line-ups
1. Serie B Brazil	70%	749
2. First League Bulgaria	55.4%	444
3. Super League 1 Greece	55.3%	472
4. Primera A Colombia	53.4%	526
5. Pro League Saudi Arabia	50.4%	470
6. Premier League Egypt	47.5%	600
7. Serie A Brazil	47.5%	746
8. Primera División Peru	47.4%	466
9. Super Liga Serbia	46%	582
10. HNL Croatia	45.5%	356
11. Süper Lig Türkiye	45%	755
12. Liga Pro Ecuador	44.4%	315
13. Indian Super League India	43.5%	230
14. Czech Liga Czechia	43.2%	556
15. Eredivisie Netherlands	42.7%	647
16. 1. Lig Türkiye	42.6%	685
17. 1. SNL Slovenia	42.5%	233
18. 1. Division Cyprus	41.1%	353
19. NB I Hungary	41%	329
20. Premier League Belarus	39.3%	387
21. Eerste Divisie Netherlands	37.3%	758
22. Pro League United Arab Emirates	36.8%	340
23. A-League Australia	36.5%	326
24. Major League Soccer United States	36.2%	905
25. Premier League Ukraine	35.1%	279
26. CONMEBOL Libertadores International	33.2%	307
27. CONMEBOL Sudamericana International	32.4%	312
28. Segunda División Spain	32.3%	936
29. Super Liga Slovakia	32.1%	368
30. AFC Champions League Elite International	31.8%	280
31. Copa del Rey Spain	30.4%	214
32. Bundesliga Austria	30%	390
33. Liga I Romania	29.4%	630
34. Primeira Liga Portugal	28.9%	615
35. Ligue 2 France	28.7%	764
36. Primera División Chile	28.1%	540
37. UEFA Europa League International	28%	350
38. J1 League Japan	27.2%	760
39. Liga MX Mexico	26.9%	684
40. 3. Liga Germany	25.9%	706

Showing every competition. Major competitions only

Exact formation as recorded.