select extract(year from fecha_creacion) as anio, extract(month from fecha_creacion) as mes,
   sum(case when tipo = 'entrada' then 1 else 0 end )
 from documento
group by extract(year from fecha_creacion), extract(month from fecha_creacion)
order by anio, mes;

$data = DB::table('documento')
     ->selectRaw('year from fecha_creacion AS anio, month from fecha_creacion AS mes')
     ->sum(case when tipo = 'entrada' then 1 else 0 end )
    ->orderBy(anio, mes, DESC)
    ->get();