Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
2010 127 192:15
2011 183 548:35
2012 1217 598:30
2013 191 613:57
2014 268 701:15
2015 523 626:35
2016 185 715:25
2017 250 674:15
2018 161 645:36
2019 385 642:45
2020 36 188:20
2021 56 381:00
2022 30 97:55
2023 47 190:15
 
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