20 villes

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<h1>Top 20 french cities by natural disasters since 1982</h1>

<p>Number of natural disasters by cities since 1982           <strong>Source :</strong> <a href="https://macommune.prim.net/gaspar/export_gaspar/download.htm">Base Gaspar</a></p>

</div>

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d3.csv("20villes.csv", function(data) {

data.sort(function(a, b) {
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