diff --git a/visualization/data/populations.csv b/visualization/data/populations.csv
index e98de9060eae75757162480edbe3dcc11600b48b..4db893fc3443b8a26215f23b8271957da670e3d2 100644
--- a/visualization/data/populations.csv
+++ b/visualization/data/populations.csv
@@ -1,4 +1,4 @@
-,Year,Belgium,Denmark,Netherlands,Sweden
+Index,Year,Belgium,Denmark,Netherlands,Sweden
 0,1950,8.6393,4.28135,10.11365,7.0166
 1,1951,8.6782,4.3037,10.2644,7.0704
 2,1952,8.7304,4.3338,10.3821,7.12445