For that indicator, The World Bank provides data for Oman from 1967 to 2017. The average value for Oman during that period was 5.54 billion U.S. dollars with a minumum of 0.02 billion U.S. dollars in 1968 and a maximum of 22.22 billion U.S. dollars in 2008.
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Definition: Gross capital formation (formerly gross domestic investment) consists of outlays on additions to the fixed assets of the economy plus net changes in the level of inventories. Fixed assets include land improvements (fences, ditches, drains, and so on); 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. Inventories are stocks of goods held by firms to meet temporary or unexpected fluctuations in production or sales, and "work in progress." According to the 1993 SNA, net acquisitions of valuables are also considered capital formation. Data are in current U.S. dollars.