observation_date,X14AICBS
1921-01-01,461
1922-01-01,343
1923-01-01,623
1924-01-01,738
1925-01-01,579
1926-01-01,924
1927-01-01,636
1928-01-01,479
1929-01-01,628
1930-01-01,1292
1931-01-01,2213
1932-01-01,1416
1933-01-01,3891
1934-01-01,44
1935-01-01,34
1936-01-01,43
1937-01-01,58
1938-01-01,52
1939-01-01,41
1940-01-01,22
1941-01-01,8