How can i get daily average steps form healthkit

Im trying to display the daily amount of steps the user takes. But is don't really know how to manage this.

I already got this code:

let endDate = NSDate()
    let startDate = NSCalendar.currentCalendar().dateByAddingUnit(.CalendarUnitMonth, value: -1, toDate: endDate, options: nil)

    let weightSampleType = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)
    let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: endDate, options: .None)

    let query = HKSampleQuery(sampleType: weightSampleType, predicate: predicate, limit: 0, sortDescriptors: nil, resultsHandler: {
        (query, results, error) in
        if results == nil {
            println("There was an error running the query: \(error)")
        }

        dispatch_async(dispatch_get_main_queue()) {
            var dailyAVG = Int()
            var steps = results as [HKQuantitySample]
            for var i = 0; i < results.count; i++
            {
                //results[i] add values to dailyAVG
            }
        }

    })

    self.healthKitStore.executeQuery(query)