Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
2006 0 61:32
2007 5 211:28
2008 197 460:04
2009 506 365:00
2010 167 637:04
2011 112 348:08
2012 602 333:29
2013 45 281:38
2014 3 156:47
2015 96 117:20
2016 78 142:02
2017 89 179:22
2018 34 222:16
2019 31 251:51
2020 115 326:27
2021 45 172:06
2022 16 72:35
 
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