Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Index May 31, 1914=100, Not Seasonally Adjusted

Frequency:  Monthly

Series Is Presented Here As Six Variables--(1)--Original Data, 1904-1913 (2)--Original Data, 1914-1920, (3)--Original Data, 1924-1929 (4)--Original Data, 1924-1929 (5)--Original Data, 1928-1934 (6)--Original Data, 1928-1934. The Six Variables In This Series Are Broken Down As Follows: 1904-1913 Data Are On A December 31, 1904 Base Of 100. 1914-1920 Data Are On A Base Of May 31, 1914=100. The Data For 1924-1929 Were Converted By NBER To A Base Of 1928=100 From An Original Index Based On December 31, 1924=100. The 1924-1929 Data Are Also Presented As Based On The Original December Date. The 1928-1934 Data Are Presented As Originally Given, In Millions Of Members. However, The NBER Has Also Converted That Original Data To An Index Based On 1928=100. These Data Were Originally Given As First Of Month Data. Here They Were Placed At The End Of The Month By NBER. Data Are For All Employment. Source: Reichsarbeitsblatt, 1920, Pp.23 And 592 Under "Mitgliederbervegnung Bie Den Krankenkassen".