A picture says more than a thousand words, or in this case, a graph. I just found out about this wonderful tool called Plotly https://plot.ly/?ref=algorithmia, which allows you to make charts and dashboards and to share them with other people.
For testing this tool I choose to download data from https://www.treasurydirect.gov/govt/reports/pd/histdebt/histdebt_histo5.htm regarding the US debt between the years 1951-2015. To make a simple graph you just add the data in Plotly spreadsheets and, voila, you have a simple graph! What surprised my with this particular graph was the shape of the US debt curve, if there is not something wrong with my eyes the debt seem to grow exponentially! My first impression was, wow, that look a bit unsustainable, but I guess they know what they are doing over there. Anyway see the graph below.