What were the average trade payables in 2019 and 2018?
{"Short-term debt and current maturities of long-term debt": {"2019": 6034, "2018": 5057, "% Change": 19}, "Trade payables": {"2019": 11409, "2018": 10716, "% Change": 6}, "Other current financial liabilities": {"2019": 1743, "2018": 1485, "% Change": 17}, "Contract liabilities": {"2019": 16452, "2018": 14464, "% Change": 14}, "Current provisions": {"2019": 3682, "2018": 3931, "% Change": -6}, "Current income tax liabilities": {"2019": 2378, "2018": 3102, "% Change": -23}, "Other current liabilities": {"2019": 9023, "2018": 9118, "% Change": -1}, "Liabilities associated with assets classified as held for disposal": {"2019": 2, "2018": 1, "% Change": 54}, "Total current liabilities": {"2019": 50723, "2018": 47874, "% Change": 6}, "Long-term debt": {"2019": 30414, "2018": 27120, "% Change": 12}, "Provisions for pensions and similar obligations": {"2019": 9896, "2018": 7684, "% Change": 29}, "Deferred tax liabilities": {"2019": 1305, "2018": 1092, "% Change": 19}, "Provisions": {"2019": 3714, "2018": 4216, "% Change": -12}, "Other financial liabilities": {"2019": 986, "2018": 685, "% Change": 44}, "Other liabilities": {"2019": 2226, "2018": 2198, "% Change": 1}, "Total non-current liabilities": {"2019": 48541, "2018": 42995, "% Change": 13}, "Total liabilities": {"2019": 99265, "2018": 90869, "% Change": 9}, "Debt ratio": {"2019": 66, "2018": 65, "% Change": ""}, "Total equity attributable to shareholders of Siemens AG": {"2019": 48125, "2018": 45474, "% Change": 6}, "Equity ratio": {"2019": 34, "2018": 35, "% Change": ""}, "Non-controlling interests": {"2019": 2858, "2018": 2573, "% Change": 11}, "Total liabilities and equity": {"2019": 150248, "2018": 138915, "% Change": 8}, "": {"2019": "", "2018": "", "% Change": ""}}
trade_payables_2019 = df["Trade payables"]["2019"]
trade_payables_2018 = df["Trade payables"]["2018"]
liabilities_2019 = df["Liabilities associated with assets classified as held for disposal"]["2019"]
answer = (trade_payables_2019 + trade_payables_2018) / liabilities_2019