Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
1997 82 63:45
1998 36 48:00
1999 22 79:45
2000 47 114:15
2001 86 130:55
2002 203 311:10
2003 254 434:00
2004 155 539:15
2005 212 741:30
2006 208 671:30
2007 130 742:30
2008 99 700:00
2009 62 629:45
2010 48 570:15
2011 65 520:15
2012 102 543:15
2013 79 410:30
2014 68 500:15
2015 84 683:45
2016 165 688:45
2017 80 671:00
2018 78 739:00
2019 97 737:00
2020 181 795:00
2021 111 787:15
2022 121 648:40
2023 10 78:02
 
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