What was the percentage change in the net Proceeds from issuance of senior notes between 2018 and 2019?
{"Proceeds from issuance of senior notes, net": {"2019": 4876.7, "2018": 584.9, "2017": 2674.0}, "Proceeds from (repayments of) credit facilities, net": {"2019": 425.0, "2018": -695.9, "2017": 628.6}, "Distributions paid on common and preferred stock": {"2019": -1603.0, "2018": -1342.4, "2017": -1164.4}, "Purchases of common stock": {"2019": -19.6, "2018": -232.8, "2017": -766.3}, "Repayments of securitized debt": {"2019": "\u2014", "2018": -500.0, "2017": -302.5}, "(Distributions to) contributions from noncontrolling interest holders, net (1)": {"2019": -11.8, "2018": -14.4, "2017": 264.3}, "Repayments of senior notes": {"2019": -1700.0, "2018": "\u2014", "2017": -1300.0}, "(Repayments of) proceeds from term loan, net": {"2019": -500.0, "2018": 1500.0, "2017": "\u2014"}, "Purchase of redeemable noncontrolling interest (2)": {"2019": -425.7, "2018": "\u2014", "2017": "\u2014"}, "Proceeds from issuance of securities in securitization transaction": {"2019": "\u2014", "2018": 500.0, "2017": ""}}
net_proceeds_2019 = df["Proceeds from issuance of senior notes, net"]["2019"]
net_proceeds_2018 = df["Proceeds from issuance of senior notes, net"]["2018"]
answer = ( net_proceeds_2019 - net_proceeds_2018 ) / net_proceeds_2018 * 100.0