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ax = sns.countplot(x="size", data=df1)
ax.set_title("Number of customers")
for p in ax.patches:
  ax.annotate(format(p.get_height(), '.2f'), (p.get_x() + p.get_width() / 2., p.get_height()), ha = 'center', va = 'center', xytext = (0, 10), textcoords = 'offset points')