What is the percentage change in Contributions in 2019?
{"Unvested contributions, January 1": {"2019": 1120426, "2018": 1039030}, "Contributions(1)": {"2019": 623705, "2018": 671911}, "Dividends credited": {"2019": 57083, "2018": 56926}, "Vested": {"2019": -523359, "2018": -501089}, "Forfeited": {"2019": -153657, "2018": -146352}, "Unvested contributions, December 31": {"2019": 1124198, "2018": 1120426}}
contributions_2019 = df["Contributions(1)"]["2019"]
contributions_2018 = df["Contributions(1)"]["2018"]
answer = (contributions_2019 - contributions_2018) / contributions_2018 * 100.0