Let's start with a table (decimal values truncated past 3rd):

Date Capital Last resort MPBOR % ROI nominal ROI effective Aug 11 60.00 60.00 2.000% 1.200 0.000 Sep 11 111.25 111.25 2.000% 2.225 2.225 Oct 11 1`152.17 1`152.17 2.000% 23.043 23.043 Nov 11 925.00 925.00 2.000% 18.500 18.500 Dec 11 5`775.71 5`775.71 2.000% 115.514 2.957 Jan 12 147.89 147.89 2.000% 2.957 2.957 Feb 12 6`212.58 6`212.58 2.000% 124.251 17.692 Mar 12 2`555.02 0.00 1.990% 50.844 50.844 Apr 12 8`428.31 5`078.31 5.000% 421.415 421.415 May 12 2`843.00 0.00 4.975% 141.439 −14.062 Jun 12 3`579.91 0.00 4.990% 178.637 178.637 Jul 12 2`623.73 0.00 4.975% 130.530 130.530 Aug 12 9`333.58 0.00 4.999% 466.669 −4`073.751 Sep 12 9`925.29 0.00 5.100% 506.189 506.189 Oct 12 12`318.77 0.00 9.000% 1`129.932 −21.303 Nov 12 41`252.48 26`469.81 9.900% 4`083.995 2`122.677

As you can see, the capital needs and interest rates paid have been growing pretty much constantly. In 7 months (out of 9) the offered bonds were able to cover the capital needs of MPOE. Bonds made a loss in three months (out of 16).

Overal figures : 107`244.70426257 BTC needed as capital, for an average of 6`702.79401641 BTC per month. 45`932.730163626 of this capital was supplied by bondholders, which comes to 42.83%. Total nominal gains from interest were 7`397.34827088 BTC, which comes to an average 6.897% over the interval. Of this effectively realised −631.44622164 BTC, which comes to an effective rate of -0.588%.

And now for some graphs :

Note : This survey covers the months of August 2011 through November 2012. There is no data earlier than August 2011 because the service was started on August the 23rd of that year. Data for December 2012 is not yet available. All data used was regularly published on the month end for 2012, and collectively in 2011, as follows : up to and including January 2012 ; February 2012 ; March 2012 ; April 2012 ; May 2012 ; June 2012 ; July 2012 ; August 2012 ; September 2012 ; October 2012 ; November 2012.

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