Over the past decade, domestic refinery output of petroleum products has grown significantly while consumption has declined, resulting in a major increase in product exports. Petroleum product exports averaged 4.1 million barrels per day (b/d) in the first four months of the year, an increase of 0.5 million b/d over exports the same time last year. Product imports are also higher than last year, but to a lesser extent, leading to an increase in net petroleum product exports.