How often is a two-goal lead thrown away?

Among matches where a side led by two at some point, how often it failed to win.

A two-goal lead is worth least in Liga Pro Serie B (Ekuador): it fails to bring a win 14% of the time.

How often is a two-goal lead thrown away?
League	Lead not held	Two-goal leads
1. Liga Pro Serie B Ekuador	14%	107
2. Liga Utama Inggris Inggris	11.4%	176
3. J2 League Jepang	11.4%	176
4. 2. Fußball-Bundesliga Jerman	10.8%	139
5. Liga Dua Inggris Inggris	10.8%	251
6. Liga Super Turki Turki	9.8%	132
7. Liga Satu Inggris Inggris	9.3%	259
8. Primeira Liga Portugal	9%	144
9. Egyptian Professional League Mesir	8.6%	116
10. Liga Utama Sepak Bola Amerika Serikat Amerika Serikat	8.2%	170
11. Liga Dua Inggris Skotlandia	7.9%	101
12. Championship Inggris	7.6%	225
13. Liga Conference Nasional Inggris Inggris	7.3%	232
14. TFF 1. Lig Turki	7%	128
15. Esiliiga Estonia	7%	114
16. Divisi Satu J. League Jepang	6.9%	131
17. Liga Utama Inggris Wales	6.8%	103
18. USL Championship Amerika Serikat	6.5%	169
19. Primera B Metropolitana Argentina	6.4%	156
20. Fußball-Bundesliga Jerman	6.4%	156
21. Ligue 2 Prancis	5.9%	135
22. Liga Profesional Argentina Argentina	5.8%	171
23. Ligue 1 Prancis	5.7%	175
24. Eredivisie Belanda	5.7%	176
25. Liga Profesional Belgia Belgia	5.7%	141
26. Liga Nacional Guatemala	5.6%	124
27. Liga Utama Inggris Skotlandia	5.3%	113
28. 3. Fußball-Liga Jerman	5%	161
29. Torneo Federal A Argentina	4.7%	276
30. Championnat National Prancis	4.3%	115
31. Liga A Lithuania Lituania	4%	101
32. Primera B Nacional Argentina	3.5%	172
33. Serie A Brasil	3.2%	157
34. Erovnuli Liga 2 Georgia	3%	132
35. Serie B Brasil	1.3%	156

Showing every competition. Major competitions only

League play only, and only matches whose recorded events add up to the final score on both sides. A draw counts as the lead thrown away.