When in the year were which birds observed?

Bird 01-01 01-08 01-15 01-22 01-29 02-05 02-12 02-19 02-26 03-05 03-12 03-19 03-26 04-02 04-09 04-16 04-23 04-30 05-07 05-14 05-21 05-28 06-04 06-11 06-18 06-25 07-02 07-09 07-16 07-23 07-30 08-06 08-13 08-20 08-27 09-03 09-10 09-17 09-24 10-01 10-08 10-15 10-22 10-29 11-05 11-12 11-19 11-26 12-03 12-10 12-17 12-24
Northern goshawk (Accipiter gentilis) 1/0
Eurasian sparrowhawk (Accipiter nisus) 1/0
Great reed warbler (Acrocephalus arundinaceus) 1/1 0/1 0/1
Marsh warbler (Acrocephalus palustris) 1/0
Sedge warbler (Acrocephalus schoenobaenus) 0/1
Eurasian reed warbler (Acrocephalus scirpaceus) 0/1 1/1 0/1 0/1
Long-tailed tit (Aegithalos caudatus) 2/1 0/1 0/2 1/0 0/1
Common kingfisher (Alcedo atthis) 0/2 1/0 1/0
Eurasian teal (Anas crecca) 1/0 1/0 1/0 1/0 1/0
Mallard (Anas platyrhynchos) 1/0 1/0 1/1 1/0 1/0 1/0 1/0 2/0 1/0
Grey heron (Ardea cinerea) 1/0 1/0 1/0 1/0 1/0 2/0 1/0
Tufted duck (Aythya fuligula) 2/0 2/0 1/0 1/0 1/0 1/0
Barnacle goose (Branta leucopsis) 1/0
Common goldeneye (Bucephala clangula) 1/0 1/0
Common buzzard (Buteo buteo) 1/0 1/0 1/1 1/1 0/1 1/0 1/1 1/0 1/0
European Goldfinch (Carduelis carduelis) 0/1 1/0 0/1 1/0 1/2 0/1 0/1 0/1 0/2 0/3 0/1 0/1 1/0 0/2 1/0 1/0 2/1 1/1 0/1
Short-toed Treecreeper (Certhia brachydactyla) 1/1 1/0 0/1 0/1 0/2
European greenfinch (Chloris chloris) 0/1 1/1 0/1 0/1 1/1 0/1 0/1 2/3 0/1 0/1 0/1 0/1
Black-headed gull (Chroicocephalus ridibundus) 1/0 1/0 1/0 2/0 1/0 0/1 1/0 1/0
White stork (Ciconia ciconia) 1/0 1/0 1/1 1/0 1/0
Feral pigeon (Columba livia f. domesticus) 1/0 1/0
Common wood pigeon (Columba palumbus) 0/1 0/1 0/1 0/1 0/1
Carrion crow (Corvus corone) 0/1 1/0 1/0 0/1 1/1 1/1 1/0 1/0
Common cuckoo (Cuculus canorus) 0/1 0/1 1/0
Eurasian blue tit (Cyanistes caeruleus) 1/0 1/0 1/0 0/2 0/1 1/4 0/4 1/0 0/1 0/1 1/1 0/1 1/0 2/0 3/0 1/0
Great spotted woodpecker (Dendrocopos major) 1/0 1/0 0/1 2/0 1/0 0/1 0/1 0/2 0/1
Lesser spotted woodpecker (Dryobates minor) 1/0
Black woodpecker (Dryocopus martius) 1/0 0/1
Yellowhammer (Emberiza citrinella) 1/0 0/1 0/1 1/0 1/1
Common reed bunting (Emberiza schoeniclus) 0/1 0/1 1/0 0/1
European Robin (Erithacus rubecula) 0/2 1/0 0/1 1/0 1/1 0/1 1/3 0/1 1/1 0/1 0/2 2/1 0/1 0/1 0/2 0/1 0/1 0/1 1/0 0/1 0/2 0/3 0/1 1/1 1/0 0/1
Merlin (Falco columbarius) 1/0 2/0 1/0 2/0 2/0 1/0 1/0 1/0
Common kestrel (Falco tinnunculus) 1/0 1/0 1/0 1/0 1/0 1/0 1/0
Common chaffinch (Fringilla coelebs) 1/0 2/0 0/1 1/1 1/1 0/1 1/1 1/1 0/1 2/0 1/3 1/1 0/1 1/1 0/1 0/1 0/1 1/3 0/2 1/3 0/1 1/0 0/1 0/2 0/1 1/0 1/0
Eurasian coot (Fulica atra) 1/0 1/0 1/1 2/0 1/0 1/0 1/0 2/0 1/0 1/0
Eurasian jay (Garrulus glandarius) 1/0 0/1 1/1 0/1 0/1 1/0 0/1 0/1 0/1
Barn swallow (Hirundo rustica) 1/0 1/0 1/0 0/1 1/0 0/1
Common gull (Larus canus) 1/0 1/0
Common nightingale (Luscinia megarhynchos) 1/1 1/0 0/1 0/1 1/0 0/1 0/1
Goosander (Mergus merganser) 1/0 0/1
Red kite (Milvus milvus) 1/0 1/0 1/0 1/0 0/1 1/0 1/1 2/0
White Wagtail (Motacilla alba) 1/0 0/1 1/0 1/0 1/0 1/0 1/0 1/1 1/0 1/0 1/0
Spotted flycatcher (Muscicapa striata) 0/1 0/1 0/1 0/1 0/1
Eurasian golden oriole (Oriolus oriolus) 0/1 0/1 0/1 0/1
Great tit (Parus major) 1/0 0/2 0/1 0/1 0/1 1/1 0/1 0/1 1/3 0/1 3/3 0/4 0/1 1/5 0/3 0/3 0/1 0/2 0/1 1/0 0/1 0/1 1/1 0/1 2/1 0/1 0/1 0/1 0/1 0/1 1/1 0/2 0/1 0/1 1/0 0/3 0/3 1/0 1/0 2/0 1/0 1/0
House sparrow (Passer domesticus) 0/1 0/1 1/1 1/1 0/1 0/1 1/0 1/0 1/0 1/0 0/1 0/1
Eurasian tree sparrow (Passer montanus) 1/0 1/0 2/0 1/0 1/0 1/1
Great cormorant (Phalacrocorax carbo) 1/0 1/0 1/0 1/0 1/1
Black redstart (Phoenicurus ochruros) 1/2 3/3 1/0 2/3 1/2 0/2 0/1 0/1 0/2 0/1 1/0
Common Chiffchaff (Phylloscopus collybita) 0/1 0/1 1/0 1/0 0/2 2/4 0/1 0/1 0/1 0/1 0/1 0/1 1/2 0/1
Willow warbler (Phylloscopus trochilus) 1/1 0/1
Eurasian magpie (Pica pica) 0/2 1/0 0/1 0/2 0/1 1/0 1/0 3/0 0/1 0/1 1/0
Great crested grebe (Podiceps cristatus) 1/0 1/0 1/0 1/0 1/0 1/0 1/0
Willow tit (Poecile montanus) 0/1 0/1 1/0 0/1 1/1
Marsh tit (Poecile palustris) 0/1 0/1 0/1 0/1 0/1 0/2 0/1 2/2 0/1 1/1
Dunnock (Prunella modularis) 0/1
Water rail (Rallus aquaticus) 1/0
Common firecrest (Regulus ignicapilla) 1/0 0/2 0/1 0/1 0/1
Goldcrest (Regulus regulus) 0/2 0/1 1/1 0/1 1/2
Whinchat (Saxicola rubetra) 0/1 1/0 1/0
Stonechat (Saxicola rubicola) 1/0
European Nuthatch (Sitta europaea) 1/0 1/0 0/1 0/1 0/1 0/1 0/1 1/0
Common tern (Sterna hirundo) 0/1 1/1
Eurasian collared dove (Streptopelia decaocto) 1/0 0/1 1/0
Common starling (Sturnus vulgaris) 1/0 1/1 2/3 2/1 1/0 1/1 1/0 0/1 1/0 1/0 0/1 1/0 1/0
Black cap warbler (Sylvia atricapilla) 0/2 0/1 0/1 0/1 3/4 2/1 1/3 0/4 1/2 0/3 0/1 0/1 0/1 0/2 0/3 0/2 0/3 0/2 1/1 1/0 0/1 1/0 1/0
Garden warbler (Sylvia borin) 0/1 0/1 0/1 0/1 0/1 0/1 1/0
Eurasian wren (Troglodytes troglodytes) 1/0 1/0 1/1 0/1 0/1 1/3 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Redwing (Turdus iliacus) 1/0 1/0 1/0
Common blackbird (Turdus merula) 1/0 1/1 1/0 0/1 0/1 2/1 1/0 0/4 0/2 0/1 0/1 0/1 0/2 0/2 1/1 0/1 1/2 1/0 0/1
Song thrush (Turdus philomelos) 0/1 1/1 1/4 0/1 0/1 0/1 0/1 0/1 0/1 1/0 0/1 0/1 0/1
Mistle thrush (Turdus viscivorus) 0/1 1/1 1/1 0/1 1/0 0/1