The Overseas Filipino Workers (OFWs) tend to be young and gender-balanced. Based on a survey conducted in 2011, the demographics indicate how the 24-29 age group constitutes 24 percent of the total and is followed by the 30-34 age group (23 percent) working abroad.[39] Male OFWs account for 52 percent of the total OFW population. The slightly smaller percentage of the female overseas workers tend to be younger than their male counterparts.[39] Production workers and service workers account for more than 80 percent of the labor outflows by 2010 and this number is steadily increasing, along with the trend for professional workers, who are mainly nurses and engineers.[39] Filipino seamen, overseas Filipino workers in the maritime industry, make an oversize impact on the global economy, making up a fifth to a quarter of the merchant marine crews, who are responsible for the movement of the majority of goods in the global economy.[40][41]