To present the actual economic development, we used the GDP index to calculate the constant GDP by taking 1978 as the base year. The equation for calculating the constant GDP was as followsVi=Vipresent/D=V1978Ai=V1978978i ai(1)where Vi is the constant value of GDP in year i, Vipresent is the current value of GDP in year i, D represents the deflator index, Ai is the GDP index of year i on the base year (1978), and ai is the GDP index of year i on the previous year (i − 1).

To present the actual purchasing capability, disposable income is adjusted to 1978-based value by using the consumer price index instead of Ai.

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