Template:Certification Table Entry/Sales/GreekPeriod/doc

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This helper template calculates periods for Greek certifications, as stated in IFPI Greece#Certification levels

It returns:

Up to 10/1990 11/1990–1997 1997–11/2002 12/2002–2005 2006–08/2009 09/2009–present
1 2 3 4 5 6

Returns 0 if the data provided is not sufficient.