Problem using Libraw about iso_speed

I opened photos taken by Nikon D7100 @iso 400, 800, 1600, 3200, 6400, 12800 and 25600 with LibRaw.
The problem is, the iso_speed values for photos @iso12800 and @iso25600 are '3.0000'.
How can I get the right iso values?

Forums: 

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Nikon's HIGH-ISOs are

Nikon's HIGH-ISOs are specified not in 'common EXIF' tag (tag id=2), but in special tag (tag id = 37).
LibRaw 0.16-beta1 already contains this change, so it should work fine).

Could you please upload sample file to somewhere (Dropbox or so)?

-- Alex Tutubalin