feat: updated app.py

app.py

@@ -324,6 +324,7 @@ elif page == "Customer Analysis":
                         
                         if not customer_sales_data.empty:
                             customer_sales = customer_sales_data[sales_columns].values[0]
+                            years = ['2021', '2022', '2023']
                             
                             fig_sales = px.line(x=years, y=customer_sales, markers=True, title=f'Sales Over the Years for Customer {customer_code}')
                             fig_sales.update_layout(xaxis_title="Year", yaxis_title="Sales")