Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
2010 63 192:15
2011 41 548:35
2012 59 598:30
2013 55 613:57
2014 99 701:15
2015 90 626:35
2016 114 715:25
2017 115 674:15
2018 136 645:36
2019 128 642:45
2020 16 188:20
2021 37 381:00
2022 27 97:55
2023 35 190:15
 
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