download_extra_iot: Download Supplemental Data
In sybrendeuzeman/WIOD_package: International Input Output Table Package

Downloads supplemental data to the local system for a single IOT. Use download_extra_iots to download supplemental data for a whole dataset.

download_extra_iot(
  extra,
  version,
  year,
  dir_data = get("dir_data", envir = paramEnv),
  dir_data_online = get("dir_data_online", envir = paramEnv)
)

`extra:`	The supplemental data to be downloaded
`version:`	The international input-output database to be used
`year:`	The year for which to add supplemental data
`dir_data:`	The directory where to store the data. Using change_dir_data seperately is most often preferred.

## Not run: 
Using change_dir_data
change_dir_data("D:/Data")
download_extra_iot("SEA", "WIOD2013", 2000)

Using dir_data parameter
download_extra_iot("SEA", "WIOD2013", 2000, dir_data = "D:/Data")

## End(Not run)