This is the "bubble" example from Joe Cheng's Google Charts package.  

Source: World Bank

Researchers should cite this work as follows:

• Example from Joe Cheng's Google Charts package:

  https://github.com/jcheng5/googleCharts

  Code licensed under GNU General Public License, version 3

  Copyright 2013 RStudio, Inc.

• (2018), "Google Charts Example - Bubble," https://qubeshub.org/resources/googlecharts.

  BibTex | EndNote

1. bubble chart
2. R
3. shiny