National Accounts - Data sources and compilation methods

In summary, the current methodology depends on establishing a “benchmark” every five years. Between these benchmarks, indicators based largely on administrative records are used to extrapolate the benchmark. At constant prices, the quarterly estimates of activity are essentially the equivalent of Indices of Production covering all types of activity in the economy. Except for price data, these quarterly estimates do not rely much on statistical surveys, which are however a key input for the benchmarks.