diff --git a/comptages/core/utils.py b/comptages/core/utils.py
index 8f9b6ea8..c3957145 100644
--- a/comptages/core/utils.py
+++ b/comptages/core/utils.py
@@ -1,6 +1,8 @@
+from operator import itemgetter
 import os
 
 from datetime import datetime
+from typing import Any
 
 from qgis.core import Qgis
 from qgis.PyQt.uic import loadUiType
@@ -65,3 +67,18 @@ def connect_to_db():
     db.open()
 
     return db
+
+
+def partial_order_with_blanks(
+    container: dict[int, Any], default_missing=None
+) -> dict[int, Any]:
+    container_copy = container.copy()
+    blanks = []
+    prev = 0
+    for k in container_copy:
+        if k > prev + 1:
+            blanks.append(k - 1)
+        prev = k
+    for b in blanks:
+        container_copy[b] = default_missing
+    return dict(sorted(container_copy.items(), key=itemgetter(0)))
diff --git a/comptages/report/yearly_report_bike.py b/comptages/report/yearly_report_bike.py
index 419b207b..8edcf51c 100644
--- a/comptages/report/yearly_report_bike.py
+++ b/comptages/report/yearly_report_bike.py
@@ -1,7 +1,6 @@
 import os
 
-
-from django.db.models import Sum, Count
+from django.db.models import Sum, Count, F
 from django.db.models.functions import Cast
 from django.db.models.fields import DateField
 from django.db.models.functions import (
@@ -13,6 +12,7 @@
 from openpyxl import load_workbook
 
 from comptages.core import definitions
+from comptages.core.utils import partial_order_with_blanks
 from comptages.datamodel.models import CountDetail, Section, Lane
 
 
@@ -153,13 +153,14 @@ def values_by_class(self):
             import_status=definitions.IMPORT_STATUS_DEFINITIVE,
         )
 
-        result = (
+        return (
             qs.annotate(res=Sum("times"))
             .values("res")
             .values("id_category__code")
             .annotate(tjm=Count("id_category__code"))
+            .annotate(code=F("id_category__code"))
+            .order_by("code")
         )
-        return result
 
     def tjm_direction_bike(self, categories, direction, weekdays=[0, 1, 2, 3, 4, 5, 6]):
         qs = CountDetail.objects.filter(
@@ -384,10 +385,18 @@ def run(self):
         row_offset = 4
         column_offset = 2
 
-        data = self.values_by_class()
         row = row_offset
-        for i in data:
-            ws.cell(row=row, column=column_offset, value=i["tjm"])
+        data = self.values_by_class()
+        # construct dict by class id and
+        data = {i["code"]: i for i in data}
+        # ensure all 6 rows / class ids are there, whether filled with data or with a blank
+        data = partial_order_with_blanks(data)
+        for value in data.values():
+            ws.cell(
+                row=row,
+                column=column_offset,
+                value=value["tjm"] if value is not None else "",
+            )
             row += 1
 
         ws = workbook["AN_GR"]