What was the percentage change in Rest of the World in 2019 from 2018?
{"Revenues from customers (1): -- China": {"2019": 514327, "2018": 348942, "2017": 260451}, "Revenues from customers (1): -- Taiwan": {"2019": 485681, "2018": 516322, "2017": 687031}, "Revenues from customers (1): -- United States": {"2019": 333059, "2018": 282869, "2017": 252516}, "Revenues from customers (1): -- Korea": {"2019": 239504, "2018": 163224, "2017": 206819}, "Revenues from customers (1): -- Europe": {"2019": 219015, "2018": 223207, "2017": 163715}, "Revenues from customers (1): -- Japan": {"2019": 175322, "2018": 158281, "2017": 169093}, "Revenues from customers (1): -- Thailand": {"2019": 87503, "2018": 59184, "2017": 29566}, "Revenues from customers (1): -- Singapore": {"2019": 84111, "2018": 108618, "2017": 101085}, "Revenues from customers (1): -- Malaysia": {"2019": 58200, "2018": 122797, "2017": 124048}, "Revenues from customers (1): -- Philippines": {"2019": 54560, "2018": 77996, "2017": 105850}, "Revenues from customers (1): -- Rest of the World": {"2019": 43683, "2018": 39362, "2017": 36432}, "Revenues from customers (1): -- ": {"2019": 2294965, "2018": 2100802, "2017": 2136606}}
revenue_2019 = df["Revenues from customers (1): -- Rest of the World"]["2019"]
revenue_2018 = df["Revenues from customers (1): -- Rest of the World"]["2018"]
answer = (revenue_2019 - revenue_2018) / revenue_2018 * 100.0