diff --git a/0_KPI_functions.py b/0_KPI_functions.py
index cdfd7e6..18a54a8 100644
--- a/0_KPI_functions.py
+++ b/0_KPI_functions.py
@@ -82,6 +82,11 @@ def tickets_kpi_function(tickets_information = None):
     tickets_kpi['nb_purchases_internet'] = tickets_kpi['nb_purchases_internet'].fillna(0)
     tickets_kpi['prop_purchases_internet'] = tickets_kpi['nb_purchases_internet'] / tickets_kpi['nb_purchases']
 
+    # Nombre d'achat à choisir
+    tickets_information_copy['month_year_purchase'] = 'purchases_' + tickets_information_copy['purchase_date'].dt.month.astype(str) + '_' + tickets_information_copy['purchase_date'].dt.year.astype(str)
+    purchases_by_month = tickets_information_copy.pivot_table(index='customer_id', columns='month_year_purchase', values='purchase_id', aggfunc='nunique', fill_value=0)
+    tickets_kpi = pd.merge(tickets_kpi, purchases_by_month, on = 'customer_id', how = 'left')
+    
     return tickets_kpi
 
 def customerplus_kpi_function(customerplus_clean = None):