Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
1956 54 13:45
1958 18 11:00
1959 2 3:20
1960 5 1:45
1961 34 8:30
1962 0 0:00
1963 13 8:00
1977 1309 29:30
1978 1463 27:30
1982 71 3:00
1986 2013 50:00
1987 6565 56:35
2001 0 0:00
2002 0 0:00
2003 648 12:30
2004 899 44:15
2005 119758 1018:50
2006 74576 647:30
2007 72450 816:41
2008 77695 648:15
2009 46342 446:08
2010 48854 645:00
2011 39558 681:30
2012 38777 422:55
2013 55303 613:10
2014 46370 473:05
2015 35365 560:45
2016 31913 427:55
2017 41920 576:05
2018 39846 430:45
2019 41163 455:27
2020 45833 506:07
2021 65455 1013:52
2022 40480 726:25
2023 12500 112:44
 
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