Data for Germany for years before 1991 pertain to the former West Germany. For more information, see http://www.bls.gov/fls/intl_gdp_capita_gdp_hour.htm#technicalnotes.
Bureau of Labor Statistics (BLS) has eliminated the International Labor Comparisons (ILC) program. This is the last BLS release of international comparisons of GDP per capita and per hour.
Source: US. Bureau of Labor Statistics
US. Bureau of Labor Statistics, Average Annual Hours Worked per Employed Person in Germany (DISCONTINUED) [DEUAHWEP], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/DEUAHWEP/, August 4, 2015.