Monthly changes in the currency component of the U.S. money supply as reported by the Federal Reserve at the St. Louis Fed's F.R.E.D. website at:  <a rel="nofollow" class="external free" href="http://research.stlouisfed.org/fred2/data/CURRNS.txt">http://research.stlouisfed.org/fred2/data/CURRNS.txt</a>
The data was copy/pasted into an OpenOffice.org Calc spreadsheet, the monthly changes were calculated using a simple formula, then this image was generated from that data.
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<span class="int-own-work" lang="en">Own work</span>