Question: The Wanhsien tiger were driven to extinction in Asia by a tiger subspecies that has been listed as Critically Endangered on the IUCN Red List since when ?

Context paragraphs:
Javan leopard: The Javan leopard ("Panthera pardus melas") is a leopard subspecies confined to the Indonesian island of Java and has been listed as Critically Endangered on the IUCN Red List since 2008.  The population is estimated at less than 250 mature individuals, with a decreasing population trend.  The total remaining habitat is estimated at only 2267.9 to .

Lion: The lion ("Panthera leo") is one of the big cats in the Felidae family and a member of genus "Panthera".  It has been listed as Vulnerable on the IUCN Red List since 1996, as populations in African range countries declined by about 43% since the early 1990s.  Lion populations are untenable outside designated protected areas. Although the cause of the decline is not fully understood, habitat loss and conflicts with humans are the greatest causes of concern.  The West African lion population is listed as Critically Endangered since 2016.  The only lion population in Asia survives in and around India's Gir Forest National Park and is listed as Endangered since 1986.

Threatened mammals of Europe: The list below contains threatened mammals that dwell in or migrate to any region in Europe, the East Atlantic Ocean, and any nearby islands of the Atlantic Ocean.  This includes mammals that are found in the East Atlantic Ocean (Azores), Iceland, the Adriatic Sea, the Sea of Azov, the Black and Caspian Sea, Corsica, Cyprus, Palearctic, Russia, Eurasia, North African Coast, the Mediterranean Sea and islands located in the Mediterranean Sea, and the islands of Spain (Canary, Balearic).  The list below was compiled from data on the IUCN Red List of Endangered Species (IUCN).  The International Union for Conservation of Nature identifies species in need of attention before approaching extinction and works to increase prevention of extinction.  The list below includes vulnerable (VU), endangered (EN), critically endangered (CR), and recently extinct (EX) species.

Wanhsien tiger: The Wanhsien tiger ("Panthera tigris acutidens"), is an extinct subspecies of tiger that lived in Asia from the late Pliocene until the middle Pleistocene.  They were driven to extinction in the islands of Indonesia by another tiger subspecies, the Trinil tiger ("P. t. trinilensis") and in Asia by yet another subspecies, the South China tiger ("P. t. amoyensis")

Indochinese tiger: The Indochinese tiger ("Panthera tigris corbetti") (Thai: เสือ โคร่ง อิน โด จีน , "S̄eụ̄x khor̀ng xin do cīn") (Vietnamese: "Hổ Đông Dương" ) is a tiger subspecies that lives in Myanmar, Thailand, Lao PDR, Viet Nam, Cambodia, and southwestern China.  It has been listed as Endangered on the IUCN Red List since 2008, as the population seriously declined and approaches the threshold for Critically Endangered.  As per 2011, the population was thought to comprise 342 individuals.  The largest population unit survives in Thailand estimated at 189 to 252 individuals.  There are 85 individuals in Myanmar, and only 20 Indochinese tigers remain in Viet Nam.  It is considered extinct in Cambodia.

South China tiger: The South China tiger ("Panthera tigris amoyensis") is a tiger subspecies in the provinces of Fujian, Guangdong, Hunan, Jiangxi in southern China.  It has been listed as Critically Endangered on the IUCN Red List since 1996, and is possibly extinct in the wild since no wild individual has been recorded since the early 1970s.  Already in the late 1990s, continued survival was considered unlikely due to low prey density, widespread habitat degradation and fragmentation, and other human pressures.  The name "Amoy tiger" was used in the fur trade.  It is also known as the "South Chinese", the "Chinese", and the "Xiamen" tiger.

Indian vulture: The Indian vulture ("Gyps indicus") is an Old World vulture native to India, Pakistan and Nepal.  It has been listed as Critically Endangered on the IUCN Red List since 2002, as the population severely declined.  Indian vultures died of renal failure caused by diclofenac poisoning.  It breeds mainly on hilly crags in central and peninsular India.  The birds in the northern part of its range once considered a subspecies are now treated as a separate species, the slender-billed vulture "Gyps tenuirostris".  These were lumped together under the name long-billed vulture.

Endangered plants of Europe: The list below contains plants that dwell in or migrate to any region in Europe and any nearby islands of the Atlantic Ocean.  This includes plants that are found in the East Atlantic Ocean (Azores), Iceland, the Adriatic Sea, the Sea of Azov, the Black and Caspian Sea, Corsica, Cyprus, Palearctic, Russia, Eurasia, North African Coast, the Mediterranean Sea and islands located in the Mediterranean Sea, and the islands of Spain (Canary, Balearic).  Twenty-one percent of Europe's vascular plant species (flowering plants, conifers and ferns) are classified as threatened, according to the IUCN.  The list below was compiled from data on the IUCN Red List of Endangered Species (IUCN).  The International Union for Conservation of Nature identifies species in need of attention before approaching extinction and works to increase prevention of extinction.  The list below includes vulnerable (VU), endangered (EN), critically endangered (CR), and recently extinct (EX) species.

Sumatran tiger: The Sumatran tiger ("Panthera tigris sumatrae") is a tiger subspecies that lives in the Indonesian island of Sumatra.  It was listed as Critically Endangered on the IUCN Red List in 2008, as the population was estimated at 441 to 679 individuals, with no subpopulation larger than 50 individuals and a declining trend.

Bengal tiger: The Bengal tiger ("Panthera tigris tigris") is the most numerous of the tiger subspecies.  By 2011, the total population was estimated at fewer than 2,500 individuals with a decreasing trend.  None of the Tiger Conservation Landscapes within the Bengal tiger's range is considered large enough to support an effective population size of 250 adult individuals.  Since 2010, it is listed as Endangered on the IUCN Red List.  An example of charismatic megafauna, the Bengal tiger is the most familiar tiger subspecies, as well as the second largest

Supporting paragraphs: Wanhsien tiger South China tiger
Answer: 1996