diff --git a/python-versions-pct.png b/python-versions-pct.png
index bb83151..76357d2 100644
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diff --git a/python-versions.png b/python-versions.png
index 4a538e3..5a8f189 100644
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diff --git a/python-versions.py b/python-versions.py
index d765ee8..41855ea 100644
--- a/python-versions.py
+++ b/python-versions.py
@@ -85,6 +85,9 @@ def fetch_main():
     db = DB()
     today = date.today()
     for year_in_the_past in count():
+        if year_in_the_past < 2017:
+            # There's no data before 2017.
+            return
         year = today.year - year_in_the_past
         for month in reversed(range(1, 13)):
             start_date = date(year, month, 1)
diff --git a/python-versions.sqlite b/python-versions.sqlite
index 7bebdfc..52fe8f9 100644
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