What was the change in software cost from 2018 to 2019?
{"Cost: -- Computers, peripheral and scientific equipment": {"2019": 1654000, "2018": 1350000}, "Cost: -- Software": {"2019": 2131000, "2018": 1749000}, "Cost: -- Leasehold improvements": {"2019": 310000, "2018": 294000}, "Cost: -- Office furniture and equipment": {"2019": 424000, "2018": 391000}, "Cost: -- ": {"2019": 4519000, "2018": 3784000}, "Cost: -- Less: Accumulated depreciation and amortization": {"2019": -2634000, "2018": -1797000}, "Cost: -- Property and equipment, net": {"2019": 1885000, "2018": 1987000}}
cost_software_2019 = df["Cost: -- Software"]["2019"]
cost_software_2018 = df["Cost: -- Software"]["2018"]
answer = cost_software_2019 - cost_software_2018