For future presentations you may just showcase some rough cycles of price increase? That would be fun tool to play around. As each day passes the data can be corrected and real values could be shown.

There's data since the end of April 2013 on Coingecko: https://www.coingecko.com/en/coins/bitcoin. Perhaps, you could use this to make the chart bigger.

That is because the default chart is calculating for 1BTC already. Generating a chart at that point would be redundant as you can just work with the landing page, which already has '1' filled in.

This tool is cool and can be useful to show you different valuations of your holdings overtime and make reasonable estimations for the future.
Could there be way to calculate for before 2015?