pre_text: MANAGEMENT DISCUSSION SNAPSHOT * (1.0) percent adjusted for currency; 0.2 percent excluding divested businesses and adjusted for currency. ** 2019 results were impacted by Red Hat purchase accounting and acquisition-related activity. + Includes charges of $2.0 billion or $2.23 of diluted earnings per share in 2018 associated with U.S. tax reform. ++At December 31
table: ($ and shares in millions except per share amounts)
table: For the year ended December 31: 2019 2018 Yr.-to-Yr. Percent/Margin Change**
table: Revenue $ 77,147 $ 79,591 (3.1)%*
table: Gross profit margin 47.3% 46.4% 0.9 pts.
table: Total expense and other (income) $ 26,322 $ 25,594 2.8%
table: Income from continuing operations before income taxes $ 10,166 $ 11,342 (10.4)%
table: Provision for income taxes from continuing operations $    731 2,619+ (72.1)%
table: Income from continuing operations $  9,435 8,723+ 8.2%
table: Income from continuing operations margin 12.2% 11.0% 1.3 pts.
table: Net income $  9,431 8,728+ 8.1%
table: Earnings per share from continuing operations—assuming dilution $  10.57 9.51+ 11.1%
table: Weighted-average shares outstanding—assuming dilution 892.8 916.3 (2.6)%
table: Assets++ $152,186 $123,382 23.3%
table: Liabilities++ $131,202 $106,452 23.2%
table: Equity++ $ 20,985 $ 16,929 24.0%
question: Analyse this data from a financial earnings document. What was the increase / (decrease) in revenue from 2018 to 2019?