Question: In what year did the country where the birthplace of Steven Blankaart is found, refuse to surrender Namibia?

full_context: Document 1: Steven Blankaart: Steven Blankaart (24 October 1650, Middelburg – 23 February 1704, Amsterdam) was a Dutch physician, iatrochemist, and entomologist, who worked on the same field as Jan Swammerdam. Blankaart proved the existence of a capillary system, as had been suggested by Leonardo da Vinci, by spouting up blood vessels, though he failed to realize the true significance of his findings. He is known for his development of injection techniques for this study and for writing the first Dutch book on child medicine. Blankaart translated works of John Mayow.
Document 2: Boschmanskop No 1 Dam: Boschmanskop No 1+2 Dam, is an earth-fill type dam on the Woes-Alleen River, near Middelburg, Mpumalanga, South Africa. It was established in 1995. Its primary purpose is flood control and it is owned by Optimum Colliery Pullen's Hope.
Document 3: Theewaterskloof Dam: Theewaterskloof Dam is an earth-fill type dam located on the Sonderend River near Villiersdorp, Western Cape, South Africa. Administratively it is located within Theewaterskloof Local Municipality. It was established in 1978 and is the largest dam in the Western Cape Water Supply System with a capacity of 480 million cubic metres, about 41% of the water storage capacity available to Cape Town, which has a population of over 4 million people. The dam mainly serves for municipal and industrial use as well as for irrigation purposes. The hazard potential of the dam has been ranked high (3).
Document 4: Eswatini: In 1903, after British victory in the Anglo-Boer war, Swaziland became a British protectorate. Much of its early administration (for example, postal services) being carried out from South Africa until 1906 when the Transvaal colony was granted self-government. Following this, Swaziland was partitioned into European and non-European (or native reserves) areas with the former being two-thirds of the total land. Sobhuza's official coronation was in December 1921 after the regency of Labotsibeni after which he led an unsuccessful deputation to the Privy council in London in 1922 regarding the issue of the land.
Document 5: Namibia: The dry lands of Namibia were inhabited since early times by San, Damara, and Namaqua, and since about the 14th century AD by immigrating Bantu who came with the Bantu expansion. Most of the territory became a German Imperial protectorate in 1884 and remained a German colony until the end of World War I. In 1920, the League of Nations mandated the country to South Africa, which imposed its laws and, from 1948, its apartheid policy. The port of Walvis Bay and the offshore Penguin Islands had been annexed by the Cape Colony under the British crown by 1878 and had become an integral part of the new Union of South Africa at its creation in 1910.
Document 6: Hippolito Salviani: Aristotle's work on fish species is one of the earliest known. In the 1500s fish enjoyed a renewed interest in both France and Italy. 1551 saw the appearance of Pierre Belon’s "Histoire naturelle des estranges poissons marins", illustrated by woodcuts. In 1554 Guillaume Rondelet’s "De piscibus marinis" was published, also using woodcuts. Salviani’s work was published in parts over a period of three years. Its use of copper engraving was well-suited to depicting fish, and greatly superior to woodcuts with its lifelike rendition of eyes and scales. The copper engravings have a scientific appearance, but some details, like the correct number and position of the scales were omitted. Nicolas Béatrizet probably designed the title-page and the fish illustrations were made by Antoine Lafréry. Another theory is that they were drawn by the Italian painter Bernardus Aretinus and engraved by Nicolas Béatrizet. Salviani's "Aquatilium animalium" only deals with animals personally observed and handled by him. He collected most of the fishes for his studies from the market in Rome.
Document 7: Blood transfusion: Working at the Royal Society in the 1660s, the physician Richard Lower began examining the effects of changes in blood volume on circulatory function and developed methods for cross-circulatory study in animals, obviating clotting by closed arteriovenous connections. The new instruments he was able to devise enabled him to perform the first reliably documented successful transfusion of blood in front of his distinguished colleagues from the Royal Society.
Document 8: Languages of Namibia: Namibia, despite its scant population, is home to a wide diversity of languages, from multiple language families: Indo - European, Bantu, and the various Khoisan families. When Namibia was administered by South Africa, Afrikaans, German, and English enjoyed an equal status as official languages. Upon Namibian independence in 1990, English was enshrined as the nation's sole official language in the constitution of Namibia. German and Afrikaans were stigmatised as having colonial overtones, while the rising of Mandela's Youth League and the 1951 Defiance Campaign spread English among the masses as the language of the campaign against apartheid.
Document 9: Molteno Dam: Molteno Dam is a small but historic dam, on the lower slopes of Table Mountain in Western Cape, South Africa. Still in service, it was established in 1877 and is now located in the suburb of Oranjezicht, Cape Town.
Document 10: Deaf education: John Bulwer, an English physician, wrote five works on bodily human communication (particularly gestures). He was the first person in England to propose educating deaf people, outlining plans for an academy in Philocophus and The Dumbe mans academie.
Document 11: Giovanni Maria Lancisi: Giovanni Maria Lancisi (Latin name: Johannes Maria Lancisius) was educated at the Collegio Romano and the University of Rome, where he qualified in medicine aged 18. He was physician to Popes Innocent XI, Clement XI and Innocent XII. He was given the lost anatomical plates of Bartolomeo Eustachius by Pope Clement XI; these were made in 1562 and had been forgotten in the Vatican Library. Lancisi edited and published them in 1714 as the "Tabulae anatomicae". He studied epidemiology, describing malaria and influenza epidemics. He published "De Noxiis Paludum Effluviis" (On the Noxious Effluvia of Marshes) in 1717, in which he recognized that mosquito-infested swamps are the breeding ground for malaria and recommended drainage of these areas to prevent it. He also published extensively on cardiology, describing vegetations on heart valves, cardiac syphilis, aneurysms and the classification of heart disease. His landmark "De Motu Cordis et Aneurysmatibus" was published posthumously in 1728.
Document 12: Nooitgedacht Dam: Nooitgedacht Dam is an earth-fill type dam located on the Komati River in South Africa. It was established in 1962 and serves mainly for irrigation purposes as well as municipal and industrial use. The hazard potential of the dam has been ranked high (3).
Document 13: Namibia: South Africa occupied the colony in 1915 after defeating the German force during World War I and administered it from 1919 onward as a League of Nations mandate territory. Although the South African government desired to incorporate 'South-West Africa' into its territory, it never officially did so, although it was administered as the de facto 'fifth province', with the white minority having representation in the whites-only Parliament of South Africa, as well as electing their own local administration the SWA Legislative Assembly. The South African government also appointed the SWA administrator, who had extensive powers. Following the League's replacement by the United Nations in 1946, South Africa refused to surrender its earlier mandate to be replaced by a United Nations Trusteeship agreement, requiring closer international monitoring of the territory's administration (along with a definite independence schedule). The Herero Chief's Council submitted a number of petitions to the UN calling for it to grant Namibia independence during the 1950s. During the 1960s, when European powers granted independence to their colonies and trust territories in Africa, pressure mounted on South Africa to do so in Namibia. In 1966 the International Court of Justice dismissed a complaint brought by Ethiopia and Liberia against South Africa's continued presence in the territory, but the U.N. General Assembly subsequently revoked South Africa's mandate, while in 1971 the International Court of Justice issued an "advisory opinion" declaring South Africa's continued administration to be illegal.
Document 14: Kwena Dam: Kwena Dam is a combined gravity & arch type dam located on the Crocodile River, near Lydenburg, Mpumalanga province, South Africa. It was established in 1984 and it serves mainly for irrigation purposes. The hazard potential of the dam has been ranked high (3).
Document 15: Namibia: Uprisings and demands by African leaders led the UN to assume direct responsibility over the territory. It recognised the South West Africa People's Organisation (SWAPO) as the official representative of the Namibian people in 1973. Namibia, however, remained under South African administration during this time as South-West Africa. Following internal violence, South Africa installed an interim administration in Namibia in 1985. Namibia obtained full independence from South Africa in 1990, with the exception of Walvis Bay and the Penguin Islands, which remained under South African control until 1994.
ground_truth: 1946
sub_queries: Steven Blankaart >> place of birth Answer: Middelburg
Middelburg >> country Answer: South Africa
When did South Africa refuse to surrender Namibia? Answer: 1946