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Annotated Heatmap - years in index - problem

The figure plotly adds years in between:

import pandas as pd
import plotly.figure_factory as ff

df = pd.DataFrame(index=[2017, 2019, 2020, 2021],
                  data={'Product A':[62.46, 118.77, 88.42, 37.35],
                        'Product B':[0, 0, 0, 0.32],
                        'Product C':[0, 0, 0, 0.43],
                        'Product D':[7.32, 15.15, 18.05, 7.47]})

import plotly.figure_factory as ff
fig = ff.create_annotated_heatmap(
            z = df.values,
            x = df.columns.tolist(),
            y = df.index.tolist(),
            colorscale='greens'
      )
fig.show()

How to avoid automatic adding years in between? Remove in this example 2018 and 2016?