Investment as percent of GDP in South Korea, September, 2019
For that indicator, TheGlobalEconomy.com provides data for South Korea from Q1 1960 to Q3 2019. The average value for South Korea during that period was 28.52 percent with a minimum of 8.48 percent in Q4 1960 and a maximum of 42.36 percent in Q2 1991.
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* indicates monthly or quarterly data series
Definition: Gross fixed capital formation including land improvements; plant, machinery, and equipment purchases; and the construction of roads, railways, and the like, including schools, offices, hospitals, private residential dwellings, and commercial and industrial buildings as percent of GDP