Write code that finds all lines in the Pandas dataframe without the "%" sign and replace all their content with NaN

import pandas as pd
df = pd.read_csv('https://raw.githubusercontent.com/justmarkham/pandas-videos/master/data/ufo.csv')
df.head()
df.shape
df.info()
df1 = df[df.City != '%']
df1.shape
df1.head()

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