Custom Indicator not moving as time passes

Hello, 

I have the below code for an indicator, to show USD strength based on 7 major pairs. But it is delayed to show the result and seems not moving along as time passes. 

Please help and advise. Thank you. :)

using System;
using cAlgo.API;
using cAlgo.API.Internals;
using cAlgo.API.Indicators;
using cAlgo.Indicators;

namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class StrengthAndWeakness : Indicator
    {

        [Output("USD", LineColor = "FFFF0005", Thickness = 2, PlotType = PlotType.DiscontinuousLine)] 
        public IndicatorDataSeries USD { get; set; }  

        private Bars EURUSD;
        private Bars GBPUSD;
        private Bars AUDUSD;
        private Bars NZDUSD;
        private Bars USDCAD;
        private Bars USDCHF;
        private Bars USDJPY;

        protected override void Initialize()
        {
            EURUSD = MarketData.GetBars(Bars.TimeFrame, "EURUSD");
            GBPUSD = MarketData.GetBars(Bars.TimeFrame, "GBPUSD"); 
            AUDUSD = MarketData.GetBars(Bars.TimeFrame, "AUDUSD"); 
            NZDUSD = MarketData.GetBars(Bars.TimeFrame, "NZDUSD"); 
            USDCAD = MarketData.GetBars(Bars.TimeFrame, "USDCAD"); 
            USDCHF = MarketData.GetBars(Bars.TimeFrame, "USDCHF"); 
            USDJPY = MarketData.GetBars(Bars.TimeFrame, "USDJPY");
        }

        public override void Calculate(int index)
        {
            USD[index] = 200*(  (1/EURUSD[index].Close)
                               *(1/GBPUSD[index].Close)
                               *(1/AUDUSD[index].Close)
                               *(1/USDCAD[index].Close)
                               *(1/NZDUSD[index].Close)
                               *  (USDCHF[index].Close)
                               *  (USDJPY[index].Close)
                               -137);
        }

    }
}