Each figure covers from January to December of the year indicated.
As of 2015, a new series for the indicator of counterfeit notes detected per each million genuine notes in circulation (or Parts Per Million - PPM) is published. This new series will be published every six months with values for the months of June
and December, the previous annual series
The calculation of the new indicator is the sum of counterfeit notes detected during the last twelve months divided by the average of the notes in circulation the last day of the same twelve previous months; whereas the previous indicator was calculated dividing by the notes in circulation the last day of the previous month, December for the published figure. This change is due to the fact that the previous series presented a huge seasonality and was optimistic, as it took one of the highest values in the year for the circulation as denominator, that is December. In contrast, this new way of calculation considers the circulating behaviour over the whole year. It does not include the seized notes before circulation.
It does not include the counterfeit banknotes captured before circulating.