The theme of this release is a review of the procedure used to assess the development in the nominal amounts of mortgage loans within different bond types. The purpose is to find a procedure which can be used to assess the nominal amounts on a daily basis. The starting point of the calculations is the nominal amounts delivered daily by OMX. Each day the change in the outstanding amount is calculated on a bond level. Positive changes are categorized as issues while negative changes are categorized as withdrawals. Summing across different groups of bonds this leads to a simple assessment of the development within bond types. However, as this assessment is not very precise we end up with time series that display several spikes and jags. By analysing the underlying issues we are able to come up with possible solutions. This leads to a number of data corrections and imposing these we end up having very smooth time series for all bond types.