Relying on three rosters of members published in 1930, 1940 and 1948, the following graphs visualize the evolution of members' nationality of the Shanghai Rotary Club over the period 1919-1948. I offer three different kinds of visualization: vertically grouped histograms, successive pie chart, and horizontal stacked charts (in the form of timelines). 

NB For better legibility, please refer to the attached PDF (doc 34