What was the percentage change in the amount in Rest of Americas in 2019 from 2018?
{"Germany": {"2019": 4486, "2018": 4184}, "Rest of EMEA": {"2019": 5386, "2018": 4742}, "EMEA": {"2019": 9872, "2018": 8926}, "United States": {"2019": 29744, "2018": 22133}, "Rest of Americas": {"2019": 411, "2018": 258}, "Americas": {"2019": 30154, "2018": 22391}, "APJ": {"2019": 1276, "2018": 922}, "SAP Group": {"2019": 41302, "2018": 32239}}
rest_of_americas_2019 = df["Rest of Americas"]["2019"]
rest_of_americas_2018 = df["Rest of Americas"]["2018"]
answer = ( rest_of_americas_2019 - rest_of_americas_2018 ) / rest_of_americas_2018 * 100.0