There have been 65 NEL's through the past 21 seasons (this excludes all fake Pit Stops in which the "leg was not over;" however it does include the legs with no rest period beginning in TAR 18).
0 NEL's have occurred on a leg with 12 teams remaining.
3 NEL's have occurred on a leg with 11 teams remaining (15, 18, 19).
0 NEL's have occurred on a leg with 10 teams remaining.
2 NEL's have occurred on a leg with 9 teams remaining (17, 18).
4 NEL's have occurred on a leg with 8 teams remaining (6, 16, 19, 20).
8 NEL's have occurred on a leg with 7 teams remaining (5, 7, 10, 11, 14, 17, 19, 21).
11 NEL's have occurred on a leg with 6 teams remaining (1, 2, 6, 8, 10, 11, 13, 16, 18, 20, 21).
14 NEL's have occurred on a leg with 5 teams remaining (1, 2, 3[x2], 4, 5[x2], 8, 9, 12, 14, 15, 19, 20).
17 NEL's have occurred on a leg with 4 teams remaining (1, 2, 4, 5, 6, 7, 8, 9, 10, 11[x2], 12, 13, 15, 16, 17, 21).
6 NEL's have occurred on a leg with 3 teams remaining (1, 2, 3, 4, 7, 9).
Digging deeper into the NEL's..
Out of the 3 NEL's that have occurred on a leg with 11 teams remaining, 3/3 were survived.
Out of the 2 NEL's that have occurred on a leg with 9 teams remaining, 2/2 were survived.
Out of the 4 NEL's that have occurred on a leg with 8 teams remaining, 2/4 were survived (16, 20).
Out of the 8 NEL's that have occurred on a leg with 7 teams remaining, 6/7 were survived (all except 14).
Out of the 11 NEL's that have occurred on a leg with 6 teams remaining, 6/11 were survived (2, 6, 8, 13, 16, 18).
Out of the 14 NEL's that have occurred on a leg with 5 teams remaining, 8/14 were survived (2, 3[x2], 4, 5[x2], 8, 9)
-Interestingly, no team has survived a 5th place NEL since Season 9's BJ & Tyler.
Out of the 17 NEL's that have occurred on a leg with 4 teams remaining, 11/17 were survived (1, 4, 5, 6, 7, 8, 9, 11[x1], 12, 13, 15).
Out of the 6 NEL's that have occurred on a leg with 3 teams remaining, 3/6 have eventually won the Race. (2, 3, 7).