If it is purely theoretical, such as ideological and political papers, it is possible that the repetition rate will increase year by year. But this is not absolute, it depends on the article. Really good articles are novel, and with the development of social economy and technology, some new words and sentences will be incorporated and some new concepts will be introduced.

Brief introduction of academic papers:

An academic paper is a scientific record of new scientific research achievements or innovative ideas and knowledge of an academic topic in an experimental, theoretical or predictive way, or a scientific summary of new progress by applying known principles, so as to provide a written document for reading, communicating, discussing or publishing in academic journals or for other purposes.

Academic papers can be divided into communicative papers and evaluative papers according to the purpose of writing.