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in 1 years, the water would have risen 1.5 mm.
in 2 years, the water would have risen 3 mm.
in 3 years, the water would have risen 4.5 mm.
in 4 years, the water would have risen 6 mm.
in 5 years, the water would have risen 7.5 mm.
in 6 years, the water would have risen 9 mm.
in 7 years, the water would have risen 10.5 mm.
in 8 years, the water would have risen 12 mm.
in 9 years, the water would have risen 13.5 mm.
in 10 years, the water would have risen 15 mm.
in 11 years, the water would have risen 16.5 mm.
in 12 years, the water would have risen 18 mm.
in 13 years, the water would have risen 19.5 mm.
in 14 years, the water would have risen 21 mm.
in 15 years, the water would have risen 22.5 mm.
in 16 years, the water would have risen 24 mm.
in 17 years, the water would have risen 25.5 mm.
in 18 years, the water would have risen 27 mm.
in 19 years, the water would have risen 28.5 mm.
in 20 years, the water would have risen 30 mm.
in 21 years, the water would have risen 31.5 mm.
in 22 years, the water would have risen 33 mm.
in 23 years, the water would have risen 34.5 mm.
in 24 years, the water would have risen 36 mm.
in 25 years, the water would have risen 37.5 mm.