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import pandas as pd
data = [[10, 18, 11], [20, 15, 8], [30, 20, 3]]
df = pd.DataFrame(data)
print(df.pct_change())
       0         1         2
  0  NaN       NaN       NaN
  1  1.0 -0.166667 -0.272727
  2  0.5  0.333333 -0.625000