What was the percentage change in Total American Tower Corporation equity between 2015 and 2016?
{"Balance Sheet Data: -- Cash and cash equivalents (including restricted cash) (2)": {"2019": 1578.0, "2018": 1304.9, "2017": 954.9, "2016": 936.5, "2015": 462.9}, "Balance Sheet Data: -- Property and equipment, net": {"2019": 12084.4, "2018": 11247.1, "2017": 11101.0, "2016": 10517.3, "2015": 9866.4}, "Balance Sheet Data: -- Total assets (3)": {"2019": 42801.6, "2018": 33010.4, "2017": 33214.3, "2016": 30879.2, "2015": 26904.3}, "Balance Sheet Data: -- Long-term obligations, including current portion": {"2019": 24055.4, "2018": 21159.9, "2017": 20205.1, "2016": 18533.5, "2015": 17119.0}, "Balance Sheet Data: -- Redeemable noncontrolling interests": {"2019": 1096.5, "2018": 1004.8, "2017": 1126.2, "2016": 1091.3, "2015": "\u2014"}, "Balance Sheet Data: -- Total American Tower Corporation equity": {"2019": 5055.4, "2018": 5336.1, "2017": 6241.5, "2016": 6763.9, "2015": 6651.7}}
total_equity_2016 = df["Balance Sheet Data: -- Total American Tower Corporation equity"]["2016"]
total_equity_2015 = df["Balance Sheet Data: -- Total American Tower Corporation equity"]["2015"]
answer = (total_equity_2016 - total_equity_2015) / total_equity_2015 * 100.0