Global R&D Expenditures

Based on data from the *OECD, the Gross Domestic Product (GDP) Spending on R&D in 2021, for OECD member and partner countries, totaled $2.1T.

*According to their website, OECD is an international organization "that works 
to build better policies for better lives." Part of their organization's work 
"monitors trends, collects data, analyses and forecasts economic development, 
and investigates evolving patterns in a broad range of public policy areas." 
They have member countries, non-member countries with OECD Working Relations, 
and countries that are in accession discussions.
Global R&D WS

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Note: 
Latest GDP Spending on R&D for Argentina, Colombia, Mexico, Russia and the United Kingdom is as of 2020
Latest GDP Spending on R&D for New Zealand is as of 2019
Latest GDP Spending on R&D for China is as of 2018

Sources: 
https://data.oecd.org/rd/gross-domestic-spending-on-r-d.htm
https://stats.oecd.org/index.aspx?lang=en#
https://www.statista.com/statistics/263591/gross-domestic-product-gdp-of-the-united-states/