New Zealand is heavily dependent on international trade,particularly in agricultural products.Exports account for a high 24 percent of its output, making New Zealand vulnerable to international commodity prices and global economic slowdowns. Food products made up 55% of the value of all the country's exports in 2014; wood was the second largest earner (7%). Its major export partners are Australia, United States, Japan, China, and the United Kingdom.On 7 April 2008, New Zealand and China signed the New Zealand–China Free Trade Agreement, the first such agreement China has signed with a developed country. The service sector is the largest sector in the economy, followed by manufacturing and construction and then farming and raw material extraction.Tourism plays a significant role in New Zealand's economy, contributing $15.0 billion to New Zealand’s total GDP and supporting 9.6 percent of the total workforce in 2010. International visitors to New Zealand increased by 3.1 percent in the year to October 2010 are expected to increase at a rate of 2.5 percent annually up to 2015.