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Very interesting exploration! btw, there is a WFR item for retrieving OWID data, too: https://resources.wolframcloud.com/FunctionRepository/resources/OWIDCOVID19Data/
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Thanks for your reply.
I didn’t know that vaccination data is available in Wolfram repository. Good to know 
The csv data file I used is referenced by Coronavirus (COVID-19) Vaccinations | Our World in Data .
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