Guided by our holistic strategic framework, we navigated a challenging macroeconomic environment to deliver positive results for the year. Our total sales volume increased 1.4% to 3.37 billion unit cases, with transactions growing 2.5% to 20.2 billion. Total revenues grew 6.7% to Ps. 194.5 billion. Operating income grew 3.0% to Ps. 25.4 billion. Operating cash flow grew 4.8% to Ps. 37.1 billion. Importantly, controlling net income reached Ps. 12.1 billion for earnings per share of Ps. 0.72 and per unit of Ps. 5.76 (Ps. 57.60 per ADS).
Our resilient Mexico operation achieved strong top-line growth, despite uncertain macroeconomic conditions. Our portfolio innovation, affordability, and commercial initiatives enabled us to generate price-mix improvements and deliver 8.1% revenue growth, while our ability to drive cost and expense efficiencies resulted in margin expansion.
In Central America, we delivered solid top-line growth, driven mainly by the strong performance of our Guatemala and Costa Rica operations. Our ability to capture synergies from new territories, expanded distribution platform, and improved point-of-sale execution enabled us to achieve outstanding volume growth in Guatemala.
Despite slow macroeconomic growth, our Brazilian operation continued its impressive turnaround, generating strong volumes that built on two years of continuous growth. Importantly, this growth is leading to market share gains across our key beverage categories, driven by our relentless consumer focus, robust portfolio, and point-of-sale execution.
After a complicated start to the year, we’re encouraged by our Colombian operation’s turnaround over the second half of 2019, driven by our efficiency, coverage, and portfolio initiatives. In Argentina, we adapted our portfolio to remain close to our consumers, driven by our affordability strategy.