Year	Millions Of Passengers
1919	15.3130
1920	15.9980
1921	15.1980
1922	16.1610
1923	16.7060
1924	16.6380
1925	16.7410
1926	17.0840
1927	16.8850
1928	16.5030
1929	16.3710
1930	15.0700
1931	13.6580
1932	11.6970
1933	11.0510