That number simply indicates how many times you've recompiled the kernel, if you have recompiled it each time a kernel errata was released... the number would have increased, presuming you never removed the GENERIC folder in the compile directory.
There have only been 3 kernel patches, 2 user land patches.. that's 5 errata entries.
From the looks of it, you're following -STABLE.. and exporting it from the CVS tree.. all the patches on the errata page are in that branch first, some minor things sometimes don't make it that far.
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