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UNESCO Institute for Statistics. (March 8, 2021). Total global spending on research and development (R&D) from 1996 to 2018 (in billion PPP U.S. dollars) [Graph]. In Statista. Retrieved June 16, 2021, from https://www.statista.com/statistics/1105959/total-research-and-development-spending-worldwide-ppp-usd/
UNESCO Institute for Statistics. "Total global spending on research and development (R&D) from 1996 to 2018 (in billion PPP U.S. dollars)." Chart. March 8, 2021. Statista. Accessed June 16, 2021. https://www.statista.com/statistics/1105959/total-research-and-development-spending-worldwide-ppp-usd/
UNESCO Institute for Statistics. (2021). Total global spending on research and development (R&D) from 1996 to 2018 (in billion PPP U.S. dollars). Statista. Statista Inc.. Accessed: June 16, 2021. https://www.statista.com/statistics/1105959/total-research-and-development-spending-worldwide-ppp-usd/
UNESCO Institute for Statistics. "Total Global Spending on Research and Development (R&d) from 1996 to 2018 (in Billion Ppp U.S. Dollars)." Statista, Statista Inc., 8 Mar 2021, https://www.statista.com/statistics/1105959/total-research-and-development-spending-worldwide-ppp-usd/
UNESCO Institute for Statistics, Total global spending on research and development (R&D) from 1996 to 2018 (in billion PPP U.S. dollars) Statista, https://www.statista.com/statistics/1105959/total-research-and-development-spending-worldwide-ppp-usd/ (last visited June 16, 2021)
