As regards foreign exchange reserves, it is well known that the choice of the currency composition in foreign exchange reserves depends on several factors such as market  BIS Review 124/2008  1  liquidity, country’s exchange rate regime and diversification strategies.
The recent ECB study and data from the IMF suggest that the share of the euro in global foreign exchange reserves have reached over 25 per cent. The share has gradually increased over the years, but recently stabilized. When interpreting these results one has to keep in mind that full data on the currency breakdown of reserves is not available.