In order to explicit the results and to support the communication, we have developed several kinds of visualizations: mainly static but also interactive (animated horizontal bar chart; as well as an interactive map (you can select the year you want to visualize data of). In particular, we have decided to develop: multiple or simple bar charts; pie charts; a map and line plots (area charts). As tools we used the following Javascript libraries: Leaflet.js, Chart.js, D3.js and AnyChart.
What we were looking for or what we wanted to visualize clearly are trends (overall picture of data over time), features (some sample of overall data, as in the map visualization), outliers (some data points in the dataset), similarity (common features of data points).
Generally speaking, we decided which visualization was best suited to represent a dataset based on what we wanted to show. For instance, when we wanted to show comparisons we used bar charts and line charts. To show composition, we used pie charts to represent simple share of total.