Monetary aggregate indices presented are Narrow money (M1) and Broad money (M3). They are calculated as averages of the monthly figures. For all countries which do not provide data corresponding to the average for the month, estimates of monthly levels have been made using end of previous and current month figures. The annual and quarterly figures are then calculated as averages of the estimated monthly data and the indices are calculated using the 1995 annual figure. The indices are based on seasonally adjusted level series expressed in national currency or euros for the Euro area. The series are updated continuously.