The key point to notice is that it was announced at the October GC in 2013 that the membership at just hit 15 million.
The 15,082,028 in the OP are the numbers reported for the end of the year 2013. The means that they were reporting an increase of 82,000 members in three months.
If you do the math, had the growth continued at the same rate as reported, there would be about 15,330,000 memb
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