If you need to know earlier exchange rates you can use a parameter 'vdate' and indicate date in 'yyyymmdd' format. For example, if you want to know rates on March 23, 2001, the address will be as follows: http://www.bank.lv/excel/valkurlv.php?vdate=20010323.
Exchange rates are available since January 1,1995.
If you have any problems in receiving these rates please