nren is unique by itself when keyed

webapp/src/pages/ECProjects.tsx

@@ -35,7 +35,7 @@ interface inputProps {
 function getJSXFromMap(data: Map<number, Map<string, ECProject[]>>) {
     return Array.from(data.entries()).map(([year, nrenMap]) => {
         return Array.from(nrenMap.entries()).map(([nren, projects]) => (
-            <tr key={nren + year + projects.length}>
+            <tr key={nren}>
                 <td style={{ whiteSpace: 'nowrap' }}>{nren}</td>
                 <td>{year}</td>
                 <td>