Velocity of money is the frequency with which a unit of money is spent on new goods and services. It is a far better indicator of economic activity than GDP, consumer prices, the stock market, or sales of men’s underwear (which Greenspan was fond of ogling).
That could easily be plotted with bitcoin as well, but it wouldn't show much.
Here's the total output. So yesterday was the record, 9.6 million coins were in transactions (so out of 9.7 million coins issued there was nearly a 100% daily velocity.)
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http://blockchain.info/charts/output-volume?showDataPoints=true×pan=allThe reason this doesn't mean much is there wasn't necessarily any economic activity occurring. Mixing coins just switches which pocket the coin lands in.