The website
http://coinmarketcap.com/ lists 42 crypto-currencies and their market caps in USD. It sums the market caps of the 42 currencies and reports it at the bottom of the page: "Total Market Cap: $15,180,515,072"
However, there is no graph available showing that Total Market Cap sum over time. Does anyone know if such a graph exists?
EDIT: Also, if there is a way I can see a "Total Market Cap Minus Bitcoin Market Cap vs Time" graph, that would be great. Ideal would be if I could select which crypto-currencies I wished to include and which I wished to exclude from the "Total Market Cap" on the graph.
Where can I get the data to make my own graphs if no such graphs are currently available?
Thank you.