...
2015-01-09 19:00, 0.000000
2015-01-11 23:00, 0.000000
2015-01-12 00:00, -3.030200
2015-01-12 01:00, -6.060400
2015-01-12 02:00, -6.060400
2015-01-12 03:00, -6.060400
2015-01-12 04:00, -6.060400
2015-01-12 05:00, -6.060400
2015-01-12 06:00, -6.060400