Bestand
19.1968,Mai/Juni=179; 23.1972,S; 29.1978,März/April; 30.1979,Juli/Aug=246,Nov/Dez=248; 31.1980,Mai/Juni=251; 32.1981,März/April=256; 33.1982,Jan/Feb=261,Sept/Okt=265; 34.1983,Sept/Okt=271; 35.1984,Juli/Aug=276; 38.1987,Sept/Okt=295; 40.1989,Mai/Juni - 45.1994,Mai/Juni = 305-335; 46.1995,Jan/Feb - 47.1996,Sep/Okt = 339-349; 48.1997,Jan/Feb - 55.2004,Sept/Okt = 351-397; 57.2006,Mai/Juni-Sept/Okt=407-409; 58.2007,Juli/Aug=414,Nov/Dez=416; 62.2011,Juli/August=438; 64.2013,Mai/Juni=449; 68.2017,Nov/Dez=476; 69.2018,Mai/Juni=479; 70.2019,März/April-Mai/Juni=484-485