Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
1997 36 63:45
1998 55 48:00
1999 11 79:45
2000 22 114:15
2001 62 130:55
2002 35 311:10
2003 109 434:00
2004 129 539:15
2005 317 741:30
2006 62 671:30
2007 73 742:30
2008 66 700:00
2009 133 629:45
2010 117 570:15
2011 156 520:15
2012 103 543:15
2013 108 410:30
2014 169 500:15
2015 63 683:45
2016 120 688:45
2017 86 671:00
2018 50 739:00
2019 112 737:00
2020 61 795:00
2021 52 787:15
2022 96 648:40
2023 21 301:27
 
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