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 (Brasil) 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 Brasil	70%	749
2. First League Bulgaria	55.4%	444
3. Liga Super Yunani Yunani	55.3%	472
4. Categoría Primera A Kolombia	53.4%	526
5. Liga Profesional Saudi Arab Saudi	50.4%	470
6. Egyptian Professional League Mesir	47.5%	600
7. Serie A Brasil	47.5%	746
8. Primera División Peru	47.4%	466
9. Super Liga Serbia	46%	582
10. HNL Kroasia	45.5%	356
11. Liga Super Turki Turki	45%	755
12. Liga Pro Ekuador	44.4%	315
13. Indian Super League India	43.5%	230
14. Czech Liga Ceko	43.2%	556
15. Eredivisie Belanda	42.7%	647
16. TFF 1. Lig Turki	42.6%	685
17. 1. SNL Slovenia	42.5%	233
18. 1. Division Siprus	41.1%	353
19. NB I Hungaria	41%	329
20. Liga Utama Belarus Belarus	39.3%	387
21. Eerste Divisie Belanda	37.3%	758
22. Liga Pro Uni Emirat Arab Uni Emirat Arab	36.8%	340
23. A-League Australia	36.5%	326
24. Liga Utama Sepak Bola Amerika Serikat Amerika Serikat	36.2%	905
25. Liga Utama Ukraina Ukraina	35.1%	279
26. Piala Libertadores Internasional	33.2%	307
27. Copa Sudamericana Internasional	32.4%	312
28. Segunda División Spanyol	32.3%	936
29. Super Liga Slovakia	32.1%	368
30. Liga Champions Elit AFC Internasional	31.8%	280
31. Piala Raja Spanyol Spanyol	30.4%	214
32. Bundesliga Austria Austria	30%	390
33. Liga I Rumania	29.4%	630
34. Primeira Liga Portugal	28.9%	615
35. Ligue 2 Prancis	28.7%	764
36. Chilean Primera División Cile	28.1%	540
37. Liga Eropa UEFA Internasional	28%	350
38. Divisi Satu J. League Jepang	27.2%	760
39. Liga MX Meksiko	26.9%	684
40. 3. Fußball-Liga Jerman	25.9%	706

Showing every competition. Major competitions only

Exact formation as recorded.