Compute a country's share of world trade in a given commodity.
Examples
# \donttest{
op <- options(comtrade.cache_dir = tempdir())
ct_share("AUS", commodity = "2601", flow = "X", year = 2023)
#> Error in ct_request(endpoint, params): Comtrade API authentication failed (HTTP 401).
#> ℹ Check your API key with `ct_set_key()`.
#> ℹ Get a free key at <https://comtradedeveloper.un.org/>
options(op)
# }