What was the percentage change in Transaction expenses between 2018 and 2019?
{"Net income": {"2019": 95973, "2018": 127980, "2017": 138668}, "Change in financial guarantee liability(1)": {"2019": 16215, "2018": "\u2014", "2017": "\u2014"}, "Transaction expenses(2)": {"2019": 11345, "2018": 2393, "2017": 2612}, "Non-recurring expenses(3)": {"2019": 2804, "2018": "\u2014", "2017": "\u2014"}, "Incremental pro forma tax expense(4)": {"2019": -24768, "2018": -21248, "2017": -54266}, "Adjusted Pro Forma Net Income": {"2019": 101569, "2018": 109125, "2017": 87014}}
transaction_expenses_2019 = df["Transaction expenses(2)"]["2019"]
transaction_expenses_2018 = df["Transaction expenses(2)"]["2018"]
answer = ( transaction_expenses_2019 - transaction_expenses_2018 ) / transaction_expenses_2018 * 100.0