diff --git a/server/vbv_lernwelt/core/create_default_users.py b/server/vbv_lernwelt/core/create_default_users.py
index f7f60a2a..eab3f30f 100644
--- a/server/vbv_lernwelt/core/create_default_users.py
+++ b/server/vbv_lernwelt/core/create_default_users.py
@@ -258,6 +258,11 @@ def create_default_users(default_password="test", set_avatar=False):
     )
     _create_student_user(
         id=TEST_STUDENT3_VV_USER_ID,
+        email="student-vv3@eiger-versicherungen.ch",
+        first_name="Vladi",
+        last_name="Volodemir",
+    )
+    _create_student_user(
         email="patrizia.huggel@eiger-versicherungen.ch",
         first_name="Patrizia",
         last_name="Huggel",
@@ -424,7 +429,7 @@ def create_default_users(default_password="test", set_avatar=False):
     )
     _create_user(
         _id=TEST_AUSBILDUNGSVERANTWORTLICHER1_USER_ID,
-        email="test-lernbegleiter1@example.com",
+        email="test-ausbildungsverantwortlicher1@example.com",
         first_name="Bruno",
         last_name="Banani-Ausbildungsverantwortlicher",
         password=default_password,
diff --git a/server/vbv_lernwelt/dashboard/graphql/types/dashboard.py b/server/vbv_lernwelt/dashboard/graphql/types/dashboard.py
index bdca5301..645773df 100644
--- a/server/vbv_lernwelt/dashboard/graphql/types/dashboard.py
+++ b/server/vbv_lernwelt/dashboard/graphql/types/dashboard.py
@@ -1,6 +1,8 @@
+from collections import defaultdict
 from itertools import groupby
 
 import graphene
+from django.db.models.functions import ExtractYear
 from graphene import Enum
 
 from vbv_lernwelt.course.graphql.types import (
@@ -306,21 +308,26 @@ class TrainingResponsibleStatisticsType(graphene.ObjectType):
     @staticmethod
     def resolve_participants_per_year(root, info):
         user = info.context.user
-        course_session_users = CourseSessionUser.objects.filter(
-            agentparticipantrelation__agent=user,
-            agentparticipantrelation__participant__course_session=root.course_session_id,
+        course_session_users = (
+            CourseSessionUser.objects.filter(
+                agentparticipantrelation__agent=user,
+                agentparticipantrelation__participant__course_session=root.course_session_id,
+            )
+            .annotate(
+                checkout_year=ExtractYear("user__checkout_information__created_at")
+            )
+            .select_related("user")
         )
-
-        grouped_course_session_users = groupby(
-            sorted(course_session_users, key=lambda x: x.created_at.year),
-            key=lambda x: x.created_at.year,
-        )
-
+        grouped_course_session_users = defaultdict(list)
+        for csu in course_session_users:
+            checkout_year = csu.checkout_year
+            if checkout_year:
+                grouped_course_session_users[checkout_year].append(csu)
         return [
             ParticipantsForYear(
                 _id=f"{root.course_session_id} {year}",
                 year=year,
-                participants=list(c),
+                participants=participants,
             )
-            for year, c in grouped_course_session_users
+            for year, participants in grouped_course_session_users.items()
         ]