Ежемесячные значения на начало отчетной даты

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Пример данных (100 записей)

dateamountcashbank_reserves
2021-07-01 00:00:0013989.013542.5446.5
2021-06-01 00:00:0013959.313516.0443.3
2021-05-01 00:00:0014136.113710.5425.6
2021-04-01 00:00:0013732.313314.3418.1
2021-03-01 00:00:0013727.013320.5406.5
2021-02-01 00:00:0013590.213180.9409.3
2021-01-01 00:00:0013826.313419.6406.7
2020-12-01 00:00:0013316.312917.6398.6
2020-11-01 00:00:0013334.512943.5390.9
2020-10-01 00:00:0013235.012849.6385.4
2020-09-01 00:00:0013128.712746.2382.5
2020-08-01 00:00:0012996.312621.0375.3
2020-07-01 00:00:0012792.012419.5372.5
2020-06-01 00:00:0012378.912004.6374.3
2020-05-01 00:00:0012111.811736.2375.6
2020-04-01 00:00:0011536.711167.5369.2
2020-03-01 00:00:0010814.210448.1366.1
2020-02-01 00:00:0010609.110241.5367.6
2020-01-01 00:00:0010979.710616.1363.5
2019-12-01 00:00:0010538.010175.5362.5
2019-11-01 00:00:0010516.410157.3359.1
2019-10-01 00:00:0010556.310200.5355.8
2019-09-01 00:00:0010511.010164.6346.4
2019-08-01 00:00:0010375.210032.6342.6
2019-07-01 00:00:0010333.89996.2337.6
2019-06-01 00:00:0010240.99905.3335.6
2019-05-01 00:00:0010335.89995.1340.7
2019-04-01 00:00:0010104.99765.6339.3
2019-03-01 00:00:0010146.29806.3339.8
2019-02-01 00:00:0010118.49776.9341.5
2019-01-01 00:00:0010646.910312.5334.4
2018-12-01 00:00:0010119.39788.6330.8
2018-11-01 00:00:0010210.39881.4329.0
2018-10-01 00:00:0010293.29963.5329.7
2018-09-01 00:00:0010294.69968.4326.2
2018-08-01 00:00:0010197.19871.1326.0
2018-07-01 00:00:0010099.59777.3322.3
2018-06-01 00:00:009889.89570.6319.3
2018-05-01 00:00:009922.19607.3314.8
2018-04-01 00:00:009543.09231.0312.0
2018-03-01 00:00:009427.89113.7314.0
2018-02-01 00:00:009261.88948.1313.7
2018-01-01 00:00:009854.19539.0315.1
2017-12-01 00:00:009174.88863.9310.9
2017-11-01 00:00:009180.38870.8309.5
2017-10-01 00:00:009225.28895.1330.2
2017-09-01 00:00:009194.68883.0311.5
2017-08-01 00:00:009174.38865.9308.4
2017-07-01 00:00:009066.58752.7313.8
2017-06-01 00:00:008907.08598.0309.0
2017-05-01 00:00:008936.68630.5306.1
2017-04-01 00:00:008697.78394.9302.8
2017-03-01 00:00:008711.68412.4299.2
2017-02-01 00:00:008628.98339.0289.9
2017-01-01 00:00:009076.18789.8286.4
2016-12-01 00:00:008425.28141.9283.4
2016-11-01 00:00:008459.58179.4280.1
2016-10-01 00:00:008557.88277.8280.0
2016-09-01 00:00:008517.68283.1234.4
2016-08-01 00:00:008555.28322.4232.9
2016-07-01 00:00:008471.98241.9230.0
2016-06-01 00:00:008371.98145.2226.7
2016-05-01 00:00:008482.48260.1222.3
2016-04-01 00:00:008224.77998.3226.4
2016-03-01 00:00:008282.88058.7224.1
2016-02-01 00:00:008197.77971.6226.1
2016-01-01 00:00:008745.98522.2223.7
2015-12-01 00:00:007942.57725.4217.0
2015-11-01 00:00:007947.97732.0216.0
2015-10-01 00:00:007931.27711.9219.3
2015-09-01 00:00:008060.57760.0300.6
2015-08-01 00:00:008013.77718.1295.6
2015-07-01 00:00:007933.07639.3293.7
2015-06-01 00:00:007830.27540.7289.5
2015-05-01 00:00:007991.97699.2292.7
2015-04-01 00:00:007815.57522.7292.8
2015-03-01 00:00:008003.07715.8287.3
2015-02-01 00:00:008047.57752.1295.5
2015-01-01 00:00:009139.88840.5299.3
2014-12-01 00:00:008227.27922.1305.1
2014-11-01 00:00:008298.57999.0299.5
2014-10-01 00:00:008242.57943.8298.7
2014-09-01 00:00:008276.57965.3311.2
2014-08-01 00:00:008149.47856.3293.1
2014-07-01 00:00:008069.47779.9289.5
2014-06-01 00:00:008040.77752.9287.8
2014-05-01 00:00:008168.47881.2287.2
2014-04-01 00:00:007917.57620.7296.8
2014-03-01 00:00:007994.37706.2288.1
2014-02-01 00:00:007959.37672.1287.2
2014-01-01 00:00:008598.28307.5290.7
2013-12-01 00:00:007884.67522.6362.0
2013-11-01 00:00:007755.67395.4360.3
2013-10-01 00:00:007726.87369.0357.8
2013-09-01 00:00:007796.57442.8353.8
2013-08-01 00:00:007761.87411.5350.3
2013-07-01 00:00:007761.37419.6341.7
2013-06-01 00:00:007613.97278.5335.4
2013-05-01 00:00:007739.17410.3328.8
2013-04-01 00:00:007408.17101.9306.2