| Country | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2015 | 2016 | 2017 |
|---|
| Azerbaijan | 1,770 | 3,000 | | 3,500 | 3,400 | 3,800 | 5,400 | 7,500 | 8,000 | 9,500 | 10,400 | 10,900 | 10,300 | 10,700 | 10,800 | 18,000 | 17,700 | 17,500 | | Estonia | 5,600 | 10,000 | | 10,900 | 12,300 | 14,300 | 17,500 | 20,300 | 21,800 | 21,000 | 18,300 | 19,100 | 20,600 | 22,100 | 22,400 | 28,600 | 29,500 | 31,700 | | Kazakhstan | 3,200 | 5,000 | 5,900 | 6,300 | 6,300 | 7,800 | 8,300 | 9,400 | 11,000 | 11,500 | 11,800 | 12,700 | 13,200 | 14,100 | 14,100 | 24,300 | 25,700 | 26,300 | | Latvia | 4,200 | 7,200 | | 8,300 | 10,200 | 11,500 | 13,700 | 16,000 | 17,700 | 17,300 | 14,500 | 14,700 | 15,900 | 18,600 | 19,100 | 24,700 | 25,700 | 27,700 | | Lithuania | 4,800 | 7,300 | | 8,400 | 11,400 | 12,500 | 13,700 | 15,300 | 16,800 | 17,800 | 15,500 | 16,000 | 19,100 | 22,000 | 22,600 | 28,400 | 29,900 | 32,400 |
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