Calculate the percentage increase in Net Sales from 2018 to 2020. Please describe and show your work.

Walmart Inc. Consolidated Statements of Income Fiscal Years Ended January 31, (Amounts in millions, except per share data) 2020 2019 2018 Revenues: Net sales $ 519,926 $ 510,329 495,761 Membership and other income 4.038 4,076 4,582 Total revenues 523,964 514,405 500,343 Costs and expenses: Cost of sales 394.605 385,301 373,396 Operating, selling, general and administrative expenses 108,791 107,147 106,510 Operating income 20,568 21,957 20,437 Interest: Debt 2,262 1,975 1,978 Finance, capital lease and financing obligations 337 371 352 Interest income (189) (217) (152 Interest, net 2,410 2,129 2,178 Loss on extinguishment of debt 3,136 Other (gains) and losses (1,958) 8,368 Income before income taxes 20,116 11,460 15,123 Provision for income taxes 4,915 4,281 4,600 Consolidated net income 15,201 7,179 10,523 Consolidated net income attributable to noncontrolling interest (320) (509) (661) Consolidated net income attributable to Walmart 14,881 6,670 9,862 Net income per common share: Basic net income per common share attributable to Walmart $ 5.27 $ 2.28 $ 3.29 Diluted net income per common share attributable to Walmart 5.19 2.26 3.28 Weighted-average common shares outstanding: Basic 2,850 2,929 2,995 Diluted 2,868 2,945 3,010 Dividends declared per common share 2.12 $ 2.08 $ 2.04 See accompanying notes