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#' @title World countries population from 1960 to 2018
#'
#' @source World Bank website \url{https://data.worldbank.org/indicator/SP.POP.TOTL}
#' @format R Data frame with 15576 obervations and 4 variables
#' \describe{
#' \item{country_name}{name of the country}
#' \item{country_code}{code of the country in three letters}
#' \item{year}{year from 1960 to 2018}
#' \item{population}{number of people}
#' }
#' @examples
#' data(world_countries_pop)
"world_countries_pop"
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