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 (Ekvador): 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 Ekvador	14%	107
2. Premier Lig İngiltere	11.4%	176
3. J2 League Japonya	11.4%	176
4. 2. Bundesliga Almanya	10.8%	139
5. Football League Two İngiltere	10.8%	251
6. Süper Lig Türkiye	9.8%	132
7. EFL League One İngiltere	9.3%	259
8. Portekiz Süper Ligi Portekiz	9%	144
9. Ed-Devrî'l-Mısrî'l-Mümtaz Mısır	8.6%	116
10. Major League Soccer Amerika Birleşik Devletleri	8.2%	170
11. Football League Two İskoçya	7.9%	101
12. Championship İngiltere	7.6%	225
13. National League (Küme) İngiltere	7.3%	232
14. 1. Lig Türkiye	7%	128
15. Esiliiga A Estonya	7%	114
16. J. Ligi Japonya	6.9%	131
17. Premier Lig Galler	6.8%	103
18. USL Championship Amerika Birleşik Devletleri	6.5%	169
19. Primera B Metropolitana Arjantin	6.4%	156
20. Bundesliga Almanya	6.4%	156
21. Ligue 2 Fransa	5.9%	135
22. Liga Profesional Argentina Arjantin	5.8%	171
23. Fransa Ligue 1 Fransa	5.7%	175
24. Eredivisie Hollanda	5.7%	176
25. Belçika Birinci Ligi Belçika	5.7%	141
26. Liga Nacional Guatemala	5.6%	124
27. Premier Lig İskoçya	5.3%	113
28. 3. Liga Almanya	5%	161
29. Torneo Federal A Arjantin	4.7%	276
30. Championnat National Fransa	4.3%	115
31. Litvanya A Ligi Litvanya	4%	101
32. Primera Nacional Arjantin	3.5%	172
33. Serie A Brezilya	3.2%	157
34. Erovnuli Liga 2 Gürcistan	3%	132
35. Serie B Brezilya	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.