This is a series of posts that records the cases of cohabitation in countries with semi-presidential constitutions. Cohabitation is defined as the situation where the president and prime minister are from different parties and where the president’s party is not represented in the cabinet. Presidents classed as non-party cannot generate any periods of cohabitation.

There have been four periods of cohabitation in Bulgaria:

Jan 1995 – Feb 1997:
President – Zhelyu Zhelev (SDS); PM – Zhan Vasilev Videnov (BSP); government – BSP, BZnS(AS), DE

July 2001 – Jan 2002
President – Petur Stoyanov (SDS); PM – Simeon Borisov Sakskoburggotski (NDSV); government – NDSV, DPS

Jan 2002 – Aug 2005:
President – Georgi Sedefchov Purvanov (BSP); PM – Simeon Borisov Sakskoburggotski (NDSV); government – NDSV, DPS

July 2009 – Jan 2012
President – Georgi Sedefchov Purvanov (BSP); PM – Boyko Borisov (GERB); government – GERB (minority)

Sources:

List of coalitions – http://www.terra.es/personal2/monolith/00europa.htm#bul
List of presidents – http://www.worldstatesmen.org/Bulgaria.html

As ever, any clarifications are welcome.