# \donttest{
# Add government expenditure
df <- data.frame(country = c("USA", "GBR", "FRA"))
result <- add_gov_exp_column(df, id_column = "country")
# With years
df <- data.frame(country = c("USA", "GBR"), year = c(2010, 2020))
result <- add_gov_exp_column(df, id_column = "country", date_column = "year")
# }
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