When around each year's contract's OI reach its max (max $ inflow)
May in bold vetical line.

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tradingview.com/chart/9xgfyv
tradingview.com/chart/83CWRD
tradingview.com/chart/H8GlTr
tradingview.com/chart/1bWM8N
tradingview.com/chart/5Ep2Af
Natural GasOpen InterestVolume

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