Looking at that rare primary source (unique really, since I imagine we can gather from it some precise statistical data), what does it tell us about the impact of the Plague?
I remember reading somewhere that the rise in mortality began before the arrival of the Plague, and the church records of Givry showed this. But I can't find the source again, and I may be misremembering. Do the Givry records show something unexpected?
The Givry registers, which exist from 1334-1357, are often cited in studies of the Black Death, but I've not seen any mention of indications of a rise in mortality before the arrival of the pandemic.
The classic study, which is available online if you are interested, is Gras's "Le registre paroissial de Givry (1334-1357) et la peste noire en Bourgogne", in Bibliothèque de l'École des chartes (1939). More recently, Byrne has used the registers to put the average number of burials per year in the village at 23; he adds that while the number of marriages in the village was usually around 17-18 a year, in 1348 there were none – but a year later, after the pandemic had passed on, there were 86 unions among the survivors. (Benedictow sounds a note of caution here, wondering if this remarkable total was "swelled by couples from the countryside who wished to get married in the more beautiful church in Givry?")
And Gottfried notes:
The Burgundian village of Givry is one of the few places in Europe for which parish registers survive before the 16th century. In 1340, the registers show a population of between 1200 and 1500; from 1338 to 1348, an average of 30 people died each year, a rather low figure for a preindustrial community. But, in 1348, this changed. In a 14-week period, 615 deaths were recorded, suggesting that overall mortality from the Black Death was about 50%.
Benedictow, using the registers in a very slightly broader way, puts the total number of deaths in Givry caused by the plague at 626 across four months, noting:
This means that in the four months of the epidemic, fifteen times more persons were entered in the burial register than the annual average for the preceding eleven years, and 2.5 times more persons than in those eleven years taken together.
As to whether any of this is "unexpected", I'd argue probably not. The figures for deaths in Givry are rather higher than the old consensus for overall mortality from the Black Death (typically put at a third of total population), but not so far out as to be statistically remarkable. And Benedictow has put the case for a revision upwards in mortality estimates – he suggests as much as 60% of the total population of Europe probably died in the great pandemic.
Sources
Ole J. Benedictow, The Black Death, 1346-1353: The Complete History (2006)
Joseph P. Byrne, Daily Life During the Black Death (2006)
________________, Encyclopedia of the Black Death (2012)
Robert S. Gottfried, The Black Death: Natural and Human Disaster in Medieval Europe (1983)