The Government of Punjab is a provincial government in the federal structure of Pakistan, is based in Lahore, the capital of the Punjab Province. The Chief Minister of Punjab (CM) is elected by the Provincial Assembly of the Punjab to serve as the head of the provincial government in Punjab, Pakistan. The current Chief Minister is Shahbaz Sharif, who became the Chief Minister of Punjab as being restored after Governor's rule starting from 25 February 2009 to 30 March 2009. Thereafter got re-elected as a result of 11 May 2013 elections. The Provincial Assembly of the Punjab is a unicameral legislature of elected representatives of the province of Punjab, which is located in Lahore in eastern Pakistan. The Assembly was established under Article 106 of the Constitution of Pakistan as having a total of 371 seats, with 66 seats reserved for women and eight reserved for non-Muslims.

Answer this question, if possible (if impossible, reply "unanswerable"): In what year did Sharif become CM?
2009