What was the percentage change in net revenue from 2017 to 2019?
{"": {"2019": "", "2018": "(in thousands, except percentage data)", "2017": ""}, "Net revenue": {"2019": 287372, "2018": 287756, "2017": 270908}, "Percentage of net revenue": {"2019": 28.8, "2018": 27.2, "2017": 26.1}, "Contribution income": {"2019": 67282, "2018": 70142, "2017": 63865}, "Contribution margin": {"2019": 23.4, "2018": 24.4, "2017": 23.6}}
net_revenue_2019 = df["Net revenue"]["2019"]
net_revenue_2017 = df["Net revenue"]["2017"]
answer = (net_revenue_2019 - net_revenue_2017) / net_revenue_2017 * 100.0