What was the percentage change in the amount of trade between 2018 and 2019?
{"Accounts receivable: -- Trade": {"2019": 176715, "2018": 166459}, "Accounts receivable: -- Allowance for doubtful accounts reserve": {"2019": -1206, "2018": -1210}, "Accounts receivable: -- Ship-from-stock and debit (SFSD) reserve": {"2019": -18862, "2018": -17362}, "Accounts receivable: -- Returns reserves (1)": {"2019": -964, "2018": -131}, "Accounts receivable: -- Rebates reserves": {"2019": -967, "2018": -446}, "Accounts receivable: -- Price protection reserves": {"2019": -657, "2018": -420}, "Accounts receivable: -- Other": {"2019": "\u2014", "2018": -329}, "Accounts receivable: -- Accounts receivable, net (1)": {"2019": 154059, "2018": 146561}}
trade_2019 = df["Accounts receivable: -- Trade"]["2019"]
trade_2018 = df["Accounts receivable: -- Trade"]["2018"]
answer = ( trade_2019 - trade_2018 ) / trade_2018 * 100.0