Question: The 2011 Mumbai bombings occurred at an opera house that was completed in what year?

Context paragraphs:
2008 Istanbul bombings: The 2008 Istanbul bombings occurred on July 27, 2008 when two explosions hit a busy shopping street in the Güngören district of Istanbul, killing seventeen people, five of them children, and injuring 154.  The attacks occurred at 9:45 p.m. local time, 18:45 UTC, on a pedestrian street closed to traffic.  The bombings were the deadliest civilian attacks in Turkey since the 2003 Istanbul bombings, five years earlier.

1 February 2008 Baghdad bombings: The 1 February 2008 Baghdad bombings occurred on 1 February 2008, when two suicide bombings occurred in Baghdad, the capital of Iraq.  The blasts killed 98 people and injured over 200 others.

2011 Mumbai bombings: The 2011 Mumbai bombings (often referred to as 13 July ) were a series of three coordinated bomb explosions at different locations in Mumbai, India, on 13 July 2011 between 18:54 and 19:06 IST.  The blasts occurred at the Opera House, at Zaveri Bazaar and at Dadar West localities, leaving 26 killed and 130 injured.

9 September 2016 Baghdad bombings: The 9 September 2016 Baghdad bombings occurred just before midnight on Friday, 9 September 2016.  Twin suicide bombings occurred at the al-Nakheel Mall in Palestine Street, in eastern Baghdad.  A car rigged with explosives detonated at the car park of the mall and an assailant blew up his car in a busy street outside shortly afterwards.  At least 40 people were killed and 60 wounded.  The bombings were later claimed by Islamic State.  The Amaq News Agency, which supports Islamic State, said that the bombers targeted "a gathering of Shi'ites".

25 August 2003 Mumbai bombings: The 25 August 2003 Mumbai bombings were twin car bombings in the Indian city of Mumbai that killed 54, and injured 244 people.  One of the bomb explosions took place at the Gateway of India, which is a major tourist attraction.  The other bomb went off in a jewellery market Zaveri Bazaar near the Mumba Devi temple in central Mumbai.  Both the bombs were planted in parked taxis and exploded during the lunch hour.  No group initially claimed responsibility for the attack, but Kashmir rebel group and Pakistan-based Lashkar-e-Toiba was blamed for it.

February 2015 Baghdad bombings: On 7 February 2015 three separate bombings in Baghdad, the capital city of Iraq, killed at least 36 people.  At least 70 people were also injured.  The bombings occurred shortly before a curfew that had been in place for a decade was lifted, but Saad Maan, a spokesman for the Iraqi Interior Ministry, said that he did not think the bombings were linked to the curfew.  On 9 February two more bombings occurred in Baghdad, one in Kadhimiya and the other in a northern Baghdad suburb.  These bombings killed a total of at least 15 people.

Royal Opera House (Mumbai): Royal Opera House, also known as Opera House in Mumbai (formerly Bombay), is India's only surviving opera house.  Situated on Charni Road, near Girgaum Chowpatti beach, the adjective ‘Royal’ was prefixed to ‘Opera House’ to reflect the fact that its foundation stone was laid during the British Raj in 1909, and King George V inaugurated the building in 1911 while the building was still under construction.  Work on the Royal Opera House was completed in 1912, although additions were made to the building up to 1915.  After years of neglect following its closure in 1993, restoration work started in 2008.  The exterior restoration was completed in 2011 and restoration was completed in 2016.  The area around the theatre is also referred to as the Opera House in Mumbai.The Opera House area has many jewellery, metal and IT companies.  On 21 October 2016, after a gap of 23 years, Royal Opera House hosted performance of Bombay-born British soprano Patricia Rozario and her husband, pianist Mark Troop.  The private event was organised by Opera House owners Maharaja Joytendrasinhji Jadeja and Maharani Kumud Kumari Jadeja of Gondal, Gujarat.

February 2016 Sayyidah Zaynab bombings: The February 2016 Sayyidah Zaynab bombings occurred on 21 February 2016 after Islamic State of Iraq and the Levant militants detonated a car bomb and later launched two suicide bombings, about 400 meters from Sayyidah Zaynab Mosque, a Shia shrine, believed to contain the grave of Prophet Muhammad's granddaughter.

1 August 2007 Baghdad bombings: The 1 August 2007 Baghdad bombings occurred on 1 August 2007, when several suicide bombings and car bombings occurred in Baghdad, the capital of Iraq.  In one of the attacks, a fuel tanker exploded near a petrol station in the suburb of Mansour, killing 50 people.

July 1979 Madrid bombings: The July 1979 Madrid bombings were a series of bomb attacks carried out by ETA political-military (ETA-pm), a faction of the armed Basque separatist group ETA.  The attacks, consisting of coordinated bombings in Barajas Airport and the train stations of Atocha and Chamartín, killed 7 people and injured a further 100.  The bombings occurred a day after two attacks in Bilbao and San Sebastian, with both attacks killing two people.

Supporting paragraphs: 2011 Mumbai bombings Royal Opera House (Mumbai)
Answer: 1912