instruction:
This task involves annotating the answer type to a given question that involve some kind of complex reasoning (including numerical reasoning). Note that the questions require looking at more than one part of the passage to answer. There are 3 possible answer types (i) spans, (ii) numbers and (iii) dates. If the answer can be found in the passage, label it as "span". If the answer is a number, label as "number". Similarly, label "date" if you think the answer to the given question is a date.
question:
Passage: The Greek Navy was relatively modern, strengthened by the recent purchase of numerous new units and undergoing reforms under the supervision of a British mission. Invited by Prime Minister Venizelos in 1910, the mission began its work upon its arrival in May 1911. Granted extraordinary powers and led by Vice Admiral Lionel Grand Tufnell, it thoroughly reorganized the Navy Ministry and dramatically improved the number and quality of exercises in gunnery and fleet maneuvers. In 1912, the core unit of the fleet was the fast armoured cruiser Georgios Averof, completed in 1910 and, at that time, the fastest and most modern warship in the combatant navies. It was complemented by three rather antiquated battleships of the Hydra class. There were also eight destroyers built in 1906-1907, and six new destroyers that were hastily bought in summer 1912 as the imminence of war became apparent. Nevertheless, at the outbreak of the war, the Greek fleet was far from ready. The Ottoman battlefleet retained a clear advantage in number of ships, speed of the main surface units and, more importantly, in the number and caliber of the ships' guns. In addition, as the war caught the fleet in the middle of its expansion and reorganization, fully a third of the fleet  only reached Greece after hostilities had started, forcing the navy to reshuffle crews, who consequently suffered from lacking familiarization and training time. Coal stockpiles and other war stores were also in short supply, while the Georgios Averof had arrived with barely any ammunition, and would remain so until late November.
Question: What is the latter year when eight destroyers were built?
answer:
date


question:
Passage: In August 2015, Czech GDP growth was 4.4%, making the Czech economy the highest growing in Europe. On 9 November 2015, unemployment in the Czech Republic was at 5.9%, the lowest number since February 2009. In September 2016, the unemployment was at 4.0%. In 2016, for first time since 1995, Czech Republic had budget surplus 61 billion CZK. In the year ending by Summer 2017, the Czech GDP grew by 4.7%, the third fastest in Europe, and unemployment was at 3% or 4% in the European or national conventions, by far the lowest rate in Europe. Dividends worth CZK 289 billion were paid to the foreign owners of Czech companies in 2016.
Question: Which year had a higher unemployment rate, 2015 or 2009?
answer:
date


question:
Passage: Anaukpetlun would not spend his scarce resources on subjugating Siam. His strategy was to pick off Siam's peripheral regions rather than launch a full-scale invasion. On 30 November 1613, he sent a small army of 4,000  to drive out the Siamese from upper Tenasserim coast. On 26 December 1613, the army defeated the Siamese at Tavoy. The Burmese followed down to Tenasserim port itself. But the Burmese were driven back with heavy losses by the wealthy port's Portuguese broadsides in March 1614. The Siamese tried to retake Tavoy but failed. Anaukpetlun then switched theatres to Lan Na, which like Martaban before was only a nominal vassal of Siam. His armies of 17,000 invaded Lan Na on 30 April 1614 from Martaban in the south and Mone in the north. Lan Na's ruler, Thado Kyaw, desperately sought help. Help came from Lan Xang, not his overlord Siam. Despite the logistical troubles and the rainy season conditions, the Burmese armies finally achieved encirclement of Lan Na and Lan Xang forces in the Chiang Mai and Lanphun pocket in August 1614. After nearly five months, on 22 December 1614, the city surrendered. Siam would not make any attempts to recover Lan Na until 1663.
Question: How many months after the invasion of Lan Na did the city surrender?
answer:

number