What is the increase / (decrease) in the Gas and Power from 2018 to 2019?
{"Digital Industries": {"2019": 2880.0, "2018": 2898.0, "% Change": -1.0}, "Smart Infrastructure": {"2019": 1500.0, "2018": 1574.0, "% Change": -5.0}, "Gas and Power": {"2019": 679.0, "2018": 722.0, "% Change": -6.0}, "Mobility": {"2019": 983.0, "2018": 958.0, "% Change": 3.0}, "Siemens Healthineers": {"2019": 2461.0, "2018": 2221.0, "% Change": 11.0}, "Siemens Gamesa Renewable Energy": {"2019": 482.0, "2018": 483.0, "% Change": 0.0}, "Industrial Businesses": {"2019": 8986.0, "2018": 8857.0, "% Change": 1.0}, "Adjusted EBITA margin Industrial Businesses": {"2019": 10.9, "2018": 11.1, "% Change": ""}, "Financial Services": {"2019": 632.0, "2018": 633.0, "% Change": 0.0}, "Portfolio Companies": {"2019": -71.0, "2018": -305.0, "% Change": 77.0}, "Reconciliation to Consolidated Financial Statements": {"2019": -2028.0, "2018": -1135.0, "% Change": -79.0}, "Income from continuing operations before income taxes": {"2019": 7518.0, "2018": 8050.0, "% Change": -7.0}, "Income tax expenses": {"2019": -1872.0, "2018": -2054.0, "% Change": 9.0}, "Income from continuing operations": {"2019": 5646.0, "2018": 5996.0, "% Change": -6.0}, "Income from discontinued operations, net of income taxes": {"2019": 3.0, "2018": 124.0, "% Change": -98.0}, "Net income": {"2019": 5648.0, "2018": 6120.0, "% Change": -8.0}, "Basic earnings per share": {"2019": 6.41, "2018": 7.12, "% Change": -10.0}, "ROCE": {"2019": 11.1, "2018": 12.6, "% Change": ""}}
gas_and_power_2019 = df["Gas and Power"]["2019"]
gas_and_power_2018 = df["Gas and Power"]["2018"]
answer = gas_and_power_2019 - gas_and_power_2018