Holdings
1.1951 - 12.1954; 14.1955 - 186.2000; 2000,1-4; 2001,2u.4=188u.190; 2002,1-2u.4=191-192u.194; 2003,2-4=196-198; 2004,1-3=199-201; 2005,1-3=203-205; 2006,1-2=207-208; 2007,1-2u.4=211-212u.214; 2008,2-4=216-218; 2009,1=216; 2010,2=220; 2011,1/2=221-222; 2012,1-2=223-224; 2013,1-2=225-226; 2014,1-2=227-228; 2015,1=229;2016,1-2=231-