del data["Unit"]
data["Bandwidth"] = bandwidth
month_year = data[["Month", "Year"]]
month_year = month_year.apply(lambda x: x[0] + " " + str(x[1]),
axis=1)
data["Month"] = month_year
del data["Year"]
data.set_index("Month", inplace=True)
del data["Bandwidth"]
data[["Unique visitors", "Number of visits"]].plot(use_index=True, rot=90)