What was the percentage change in net revenues between 2018 and 2019?
{"Product revenues": {"April 26, 2019": 3755, "April 27, 2018": 3525, "April 28, 2017": 3060}, "Strategic": {"April 26, 2019": 2709, "April 27, 2018": 2468, "April 28, 2017": 2000}, "Mature": {"April 26, 2019": 1046, "April 27, 2018": 1057, "April 28, 2017": 1060}, "Software maintenance revenues": {"April 26, 2019": 946, "April 27, 2018": 902, "April 28, 2017": 905}, "Hardware maintenance and other services revenues": {"April 26, 2019": 1445, "April 27, 2018": 1492, "April 28, 2017": 1526}, "Hardware maintenance support contracts": {"April 26, 2019": 1182, "April 27, 2018": 1214, "April 28, 2017": 1258}, "Professional and other services": {"April 26, 2019": 263, "April 27, 2018": 278, "April 28, 2017": 268}, "Net revenues": {"April 26, 2019": 6146, "April 27, 2018": 5919, "April 28, 2017": 5491}}
net_revenues_2019 = df["Net revenues"]["April 26, 2019"]
net_revenues_2018 = df["Net revenues"]["April 27, 2018"]
answer = (net_revenues_2019 - net_revenues_2018) / net_revenues_2018 * 100.0