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Year
Totals
Observation hours
1960
0
0:00
1961
0
0:00
1962
0
0:00
1963
0
0:00
1964
0
0:00
1965
0
0:00
1966
0
0:00
1967
0
0:00
1968
0
0:00
1969
0
0:00
1970
0
0:00
1971
0
0:00
1972
0
0:00
1973
0
0:00
1974
0
0:00
1975
0
0:00
1976
0
0:00
1977
117
791:25
1978
398
820:52
1979
159
934:10
1980
315
731:36
1981
327
944:01
1982
82
768:05
1983
11
673:25
1984
54
682:07
1985
98
775:03
1986
116
933:53
1987
213
1120:12
1988
97
1184:32
1989
47
1293:12
1990
129
944:40
1991
88
858:50
1992
61
759:26
1993
75
827:13
1994
31
1135:36
1995
257
1315:15
1996
870
1503:39
1997
282
1460:20
1998
227
1162:42
1999
1027
1225:50
2000
160
1031:40
2001
1710
1273:17
2002
305
1125:31
2003
3780
1253:15
2004
96
1065:05
2005
159
1111:24
2006
149
964:46
2007
109
1089:29
2008
173
1099:59
2009
279
1282:49
2010
2077
1288:05
2011
68
1234:15
2012
45
1364:55
2013
1248
1352:29
2014
13
1299:50
2015
120
1223:30
2016
105
1409:54
2017
263
524:40
2018
512
1539:51
2019
136
1131:19
2020
227
1214:00
2021
373
1459:20
2022
66
1340:25
2023
0
864:40
» Phenology
» Record counts
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