There are lot of factors so vaccination itself will not tell the story.
eg. how long vaccinations last. type of vaccination (mrna or other), varient that is active in the country, how well people react to safety measures such as face masks and social distancing, how they live (eg apartment, flats, settlements), average age of population vaccinated, how much of population not vaccinated (eg children), and last not least how often a person is exposed or viral load an average person will is exposed.
A recent study by Pnn and Rockerfeller stated that vaccination has very effective prevention of infection and also hospitalization and also detection of 'super immunity' in certain people who are immune not only to the vaccinated but also most of the VOI and VOC and also some of the generated mutants and SARS Cov 1 !! (this group were who got infected but survived and also vaccinated) . But research did not examine vaccinated , and break through infected sample. It is nearly impossible to monitor all the variables in a significant population to publish them(unlike SL where even a very small populaiton tests are give much publicity and conclusions are also reached from such statistically insignificant samples and findings).https://www.npr.org/sections/goatsandsoda/2021/09/07/1033677208/new-studies-find-evidence-of-superhuman-immunity-to-covid-19-in-some-individuals
Read and understand you need not be a medical person to understand basics of science(again an apology to our media who jump with wrong conclusions all the time)