From an OxfordWords Blog Post by Dr. Philip Durkin, Deputy Chief Editor of the Oxford English Dictionary, and author of Borrowed Words: A History of Loanwords in English:
In Borrowed Words: A History of Loanwords in English I examine how words borrowed from different languages have influenced English throughout its history. The above feature summarizes some of the main data from the book, focussing on the fourteen sources that have given the most words to English, as reflected by the new and revised entries in the Oxford English Dictionary.
Using the date buttons at the top of the graphic, you can compare the impact that different languages have made on English over time. In the “per period” view, you can see the proportions of words coming into English from each source in 50-year slices from 1150 up to the present day. Compare for instance how the input from German has grown and then declined again from 1800 to the present day. (The earliest period, pre-1150, is much longer than 50 years, because more precise dating of words from this early stage in the history of English is very problematic.)
If you switch to the “cumulative” view, then you can see how the total number of loanwords from each language has built up over time. Here the shifts from one 50-year period to another are rather less dramatic, but the long-term shifts are still very striking. You can see, for instance, how German, Spanish, and Italian all slowly come to greater prominence. You can see this very clearly if you select any start date and then press the “play” button. (If you would like to see the numbers behind the graphic, a selection of graphs and charts from Borrowed Words are available on our companion website.