Renewable natural capital per capita, forest recreation, hunting and fishing services (real chained 2019 US$)
Renewable natural capital includes assets such as agricultural land (cropland and pastureland), forests (timber, and three ecosystem services: water, recreation, and non-wood forest products), mangroves, marine fish stocks, and hydropower. The values are reported in real chained 2019 US dollars, calculated using the Törnqvist volume index method. Individual sub-components of renewable natural capital, like forest recreation, hunting and fishing services, are not calculated using the Törnqvist index, as their trends follow changes in physical volumes expressed in real 2019 chained US dollars.
The aggregate national comprehensive wealth index is calculated using the Törnqvist volume index, applied to wealth categories like produced capital, nonrenewable and renewable natural capital, human capital, and net foreign financial assets. For each asset, except financial assets, an unchained index is first computed as a weighted geometric mean of the "quantity relatives" between periods, using nominal value shares as weights. These unchained indices are then chained to form a time series with 2019 as the base year. Since each category is calculated using this method, they cannot be simply added to estimate the total index. The final chained index is expressed in monetary terms by applying the chained Törnqvist index to the base year’s aggregate nominal value, providing a more accurate reflection of wealth changes and sustainability.