I calculated for each week in 2013 and 2014 the proportion sales amount of kids shoes to the total sales for a shoe shop in Belgium. Then, on [google correlate], I looked for correlated search terms.
I found significant results in the US (mainly soccer related) and the Netherlands (mainly children clothes related). In Belgium, I find significant results for my 2013 data (specifically September), but if I supply my 2014 data too, it finds nothing. If I supply only my 2013 for a search in the US or the Netherlands, I see the data for the correlated term is displayed for 2014 too, but not for Belgium.
What could explain this?