PerformanceCounterType.NumberOfItems32 count last minute

Question

How to count the total increment of last minute?

        //Create Counter
        CounterCreationDataCollection counter = new CounterCreationDataCollection();

        CounterCreationData total = new CounterCreationData();
        total.CounterName = "totalOps";
        total.CounterType = PerformanceCounterType.NumberOfItems32;
        counter.Add(total);