 Hi, this is Dr. Don. I've had some questions about how to construct a 100% stacked area chart. So I'll show you very quickly how to do that with Excel. The 100% stacked area I know was in Excel 2016 and Excel 2013. I'm not sure of other older versions, but most of them have it. In our data here, we've got five regions of this company and the world column is the total of these five regions. Now what I want to show in this chart is what percent of the world sells each of these regions contribute as we go through the year. So that's what 100% stacked area chart shows us. I'm gonna click there in month and just drag down to select the five regions and all of the years. I've got some rows hidden there in case you're wondering why. I'm gonna go to Insert, Recommended Chart and then I'm gonna go to All Charts, Area Chart. And these are the types of area charts. Remember, stay away from 3D. They just add complexity and don't help comprehension. That's the regular area chart. This is a stacked chart, which is not what we want. This third one is the 100% stacked chart. I select that and click OK. And we get our chart that you can then go ahead and format putting in a title, axis titles on the X and Y, think about the legend. What it's showing us here, for example, here in January, blue is USA and it makes up about 80% of the company's total sales. And you can see it changes a bit, but the USA is responsible of about 80% of the sales throughout this whole period. The gray is the Europe and you can see it's a pretty big honk. The orange is the Asia and it's growing but it's got a long way to go. This little orange one there is the America, South America's and they're not contributing a whole lot and they're not changing a whole lot. Anyway, that's the 100% stacked area chart. You don't have to do any calculations on percentages. Excel will do it for you. I hope this helps.