Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
2000 2158 93:00
2001 5016 287:00
2002 10335 316:00
2003 3657 382:42
2004 5483 342:37
2005 8676 554:39
2006 11963 657:43
2007 25896 725:19
2008 43617 1488:17
2009 12940 799:54
2010 34797 900:27
2011 22700 834:45
2012 33391 840:54
2013 24356 890:41
2014 28277 864:15
2015 13458 727:16
2016 22279 659:29
2017 32509 777:46
2018 28895 766:48
2019 19320 683:31
2020 11368 839:09
2021 15080 921:00
2022 21083 853:07
 
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