Template:INRConvert/HistoricalRate

This subtemplate takes in two parameters:
 * 1) target currency
 * 2) Default: USD
 * 3) Supported values:
 * 4) XDR - special drawing rights unit
 * 5) USD - United States dollar
 * 6) GBP - Pound sterling
 * 7) JPY - Japanese yen
 * 8) DEM - Deutsche mark, only supported when the year argument between 1970 and 1998
 * 9) EUR - euro, only supported when the year argument is 1999 or greater
 * 10) conversion calendar year
 * 11) Default:  (last year)
 * 12) Supported values: any whole-digit year between 1970 and 2018
 * 13) The Deutsche mark is not supported after 1998
 * 14) The euro is not supported before 1999

It outputs the number of rupees per a single unit of the given currency using the average exchange rate in the given calendar year.


 * Data sources:
 * 1) 1970-1980:
 * 2) 1981-2018: