This may result in certain variations in relation to the data in constant currency reported by the countries, which depend on the degree of exchange-rate appreciation ordepreciation implicit in the official parity of each country's currency in relation to 2000, and also on the population data on which the per capita calculations are based. Depending on the country, these may be directorates, departments, sections or units for planning, budgeting or social policy within the ministries of the treasury, finance or the economy. In addition, information on budgetary execution was obtained from the countries' general accounting offices or treasury departments, and occasionally from central banks, national statistical institutes, and national social and economic information systems.