# Lets count the total number of countries present in our data
print('There are a total number of {} countries in our data'.format(len(data.country.unique())))

# Let's count the number of billioniares across countries
nations_count = data.country.value_counts().head(20)
nations_count['Other countries'] = data.country.value_counts()[21:].sum()
display(nations_count.head())