What was the change in net sales between 2016 and 2017?
{"Consolidated Statements of Income data: -- Net sales": {"2019 (1)": 5349.5, "2018": 3980.8, "2017 (1)": 3407.8, "2016": 2173.3, "2015": 2147.0}, "Consolidated Statements of Income data: -- Special charges and other, net (2)": {"2019 (1)": 33.7, "2018": 17.5, "2017 (1)": 98.6, "2016": 4.0, "2015": 2.8}, "Consolidated Statements of Income data: -- Loss on settlement of debt (3)": {"2019 (1)": -12.6, "2018": -16.0, "2017 (1)": -43.9, "2016": "$\u2014", "2015": -50.6}, "Consolidated Statements of Income data: -- Net income from continuing operations": {"2019 (1)": 355.9, "2018": 255.4, "2017 (1)": 170.6, "2016": 323.9, "2015": 365.3}, "Consolidated Statements of Income data: -- Basic net income per common share from continuing operations": {"2019 (1)": 1.51, "2018": 1.1, "2017 (1)": 0.79, "2016": 1.59, "2015": 1.84}, "Consolidated Statements of Income data: -- Diluted net income per common share from continuing operations": {"2019 (1)": 1.42, "2018": 1.03, "2017 (1)": 0.73, "2016": 1.49, "2015": 1.65}, "Consolidated Statements of Income data: -- Dividends declared per common share": {"2019 (1)": 1.457, "2018": 1.449, "2017 (1)": 1.441, "2016": 1.433, "2015": 1.425}, "Consolidated Balance Sheets data: -- Total assets": {"2019 (1)": 18350.0, "2018": 8257.2, "2017 (1)": 7686.9, "2016": 5537.9, "2015": 4780.7}, "Consolidated Balance Sheets data: -- Net long-term debt and capital lease obligations, less current maturities (3)": {"2019 (1)": 8956.0, "2018": 1769.1, "2017 (1)": 2912.1, "2016": 2465.8, "2015": 1840.0}, "Consolidated Balance Sheets data: -- Microchip Technology stockholders' equity": {"2019 (1)": 5287.5, "2018": 3279.8, "2017 (1)": 3270.7, "2016": 2150.9, "2015": 2044.7}}
net_sales_2017 = df["Consolidated Statements of Income data: -- Net sales"]["2017 (1)"]
net_sales_2016 = df["Consolidated Statements of Income data: -- Net sales"]["2016"]
answer = net_sales_2017 - net_sales_2016