Change calcul coeff year

models/nichoirs_stat_year.py

@@ -43,10 +43,7 @@ class NichoirsStatYear(models.Model):
     def _compute_coeff_year(self):
         for res in self:
             if res.year:
-                if date.today().year == res.year:
-                    res.coeff_year = 1
-                else:
-                    res.coeff_year = date.today().year - res.year
+                res.coeff_year = ( date.today().year - res.year ) + 1
 
     @api.depends('product_qty', 'coeff_year')
     @api.multi