Using Set library to build custom array

I have an array with this format:

Array (     [0] => Array         (             [0] => Array                 (                     [year] => 2011                     [month] => 8                 )          )
...

with different combinations of years and months, ordered chronologically.

I want to get an array that counts the number of month appearances in each year

Array ( [2011] => Array ( [8] => 10
[7] => 15 
)

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