Среднемесячные значения индекса Арктического Колебания

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Пример данных (100 записей)

m4404m4405p1147_ip1145_i
19501-0.06-0.19
195020.63-0.21
19503-0.01-0.21
195040.56-0.22
195050.07-0.23
195060.54-0.24
19507-0.8-0.25
19508-0.85-0.26
195090.36-0.26
195010-0.38-0.27
195011-0.52-0.27
195012-1.93-0.27
19511-0.08-0.27
19512-0.4-0.27
19513-1.93-0.27
19514-0.78-0.27
19515-0.86-0.27
19516-0.92-0.27
195170.09-0.27
19518-0.38-0.27
19519-0.82-0.27
195110-0.21-0.27
195111-0.07-0.27
1951121.99-0.27
195210.37-0.27
19522-1.75-0.27
19523-1.86-0.28
195240.54-0.28
19525-0.77-0.29
19526-0.44-0.29
195270.38-0.3
19528-0.03-0.3
19529-0.38-0.3
195210-0.44-0.31
195211-1.89-0.31
195212-1.83-0.31
19531-1.04-0.32
19532-0.25-0.32
195331.07-0.31
19534-1.26-0.31
19535-0.56-0.3
195360.02-0.29
195370.33-0.29
195380.08-0.28
195390.66-0.28
195310-0.19-0.27
1953110.35-0.26
1953120.58-0.26
19541-0.15-0.25
19542-0.18-0.24
195430.48-0.23
195440.51-0.23
19545-1.66-0.22
19546-0.27-0.22
195470.34-0.22
19548-0.12-0.22
195490.3-0.23
1954100.51-0.23
195411-0.33-0.23
1954120.55-0.22
19551-1.16-0.22
19552-1.54-0.22
19553-1.57-0.23
195540.19-0.23
195550.24-0.23
19556-0.27-0.24
195570.33-0.24
195580.76-0.25
195590.36-0.25
1955100.1-0.26
195511-1.34-0.27
195512-0.44-0.28
19561-1.2-0.3
19562-2.03-0.31
195630.47-0.31
19564-0.87-0.31
195651.39-0.32
195660.28-0.32
19567-0.21-0.32
19568-0.65-0.32
19569-0.2-0.32
1956101.14-0.32
195611-0.07-0.33
1956120.0-0.33
195712.06-0.33
19572-1.51-0.33
19573-2.01-0.34
195740.24-0.35
19575-0.97-0.36
19576-0.76-0.37
19577-0.65-0.38
195780.1-0.39
19579-0.96-0.4
1957100.9-0.42
195711-1.38-0.43
1957120.83-0.44
19581-1.44-0.45
19582-2.23-0.45
19583-2.52-0.45
19584-0.36-0.46