You haven't provided much evidence of it happening elsewhere, or of the 'small' numbers. It may even be that the death toll of Asian famines has been exaggerated by this practice of widow burning following a male death.
As kvasir has already pointed out and one could find many evidence from simple google search.
Following is copy paste from wiki:-
According to
Axel Michaels, the first inscriptional evidence of the practice is from
Nepal in 464 CE, and in India from 510 CE.The early evidence suggests that widow-burning practice was seldom carried out in the general population.
Centuries later, instances of
sati began to be marked by inscribed memorial stones called Sati stones. According to J.C. Harle, the medieval memorial stones appear in two forms –
viragal (hero stone) and
satigal (sati stone), each to memorialize something different. Both of these are found in many regions of India, but "rarely if ever earlier in date than the 8th or 9th century".Numerous memorial
sati stones appear 11th-century onwards, states Michaels, and the largest collections are found in
Rajasthan
In the 1886 published
Hobson-Jobson,
Henry Yule and
Arthur Coke Burnell mention the practice of
Suttee (sati) as an early custom of Russians near
Volga, tribes of
Thracians in southeast Europe, and some tribes of Tonga and Fiji islands
The sacrifice of widow(s) or a great man's retainers at his death is attested in various Indo-European cultures outside of India. As an example where the widows vied for the honour to die with their common husband, the 5th-century BCE historian
Herodotus mentions the
Krestones tribe among the
Thracians. The woman found to have been held highest in the husband's favour while he lived had her throat slit on his grave, the surviving wives reputedly regarding it as a great shame to have to live on. Citing the
Gothic Wars of
Procopius (written circa AD 550),
Edward Gibbon notes that among the Germanic tribe of the
Heruli, a widow typically hanged herself upon her husband's tomb.
In 1968, Eberhard stated that the practice of widow burning was observed inside China, but was rare and influenced by India.Chinese sociology studies that followed suggest that the practice was historically more widespread, far removed from India (near the Korean peninsula), and found among the
Manchu people of China where a widow would ritually commit suicide after her husband died (Chinese:
xunsi,
congxun). After her suicide, she was socially celebrated as a virtuous chaste widow.This Altaic tradition was not limited to the Manchu people of China, but also found in other Chinese ethnic groups.The practice of self-immolation and other forms of public suicide by widows were observed, for example, in
Fukien province of southeast China, in some cases in duress after a rape attempt and in other cases voluntarily without duress.
A similar practice of widow suicide to follow her husband or fiancé, states Hai-soon Lee, existed in medieval Korea, in accordance with the traditional Confucian ethos.According to Martina Deuchler, this practice was praised as
misok (beautiful custom), and the dead widow praised as "faithful wife", in the historic Korean culture and literature.
A well-known case is that of the 10th-century AD
ship burial of the
Rus' described by
Ibn Fadlan. Here, when a female slave had said she would be willing to die, her body was subsequently burned with her master on the pyre.
Such rituals as widow sacrifice/widow burning have, presumably, prehistoric roots. Early 20th-century pioneering anthropologist
James G. Frazer, for example, thought that the legendary Greek story of
Capaneus, whose wife Evadne threw herself on his funeral pyre, might be a relic of an earlier custom of live widow-burning. The strangling of widows after their husbands' deaths are attested from as disparate cultures as the
Natchez people in present-day US state
Louisiana, to a number of
Pacific Islander cultures.
Now even after being spoon-fed all this evidence ,you still clings to your biased views then you're nothing but a butthurt troll.