Historical clue formulations

• Like the developers of Skype — 2012-06-23
• Native of the land known by natives as Eesti — 2010-11-16
• Finnic language — 2008-03-02
• Tallinn native — 2004-10-19
• Relative of Finnish — 2001-06-16
• Finnic language — 2000-12-09
• European language of one million — 1998-07-19