查询结果如下：   

年份	分类	数值(Quadrillion Btu)
2000	Coal Exports	1.53
2001	Coal Exports	1.27
2002	Coal Exports	1.03
2003	Coal Exports	1.12
2004	Coal Exports	1.25
2005	Coal Exports	1.27
2006	Coal Exports	1.26
2007	Coal Exports	1.51
2008	Coal Exports	2.07
2009	Coal Exports	1.51
2010	Coal Exports	2.10
2011	Coal Exports	2.75
2012	Coal Exports	3.09
2013	Coal Exports	2.90
2014	Coal Exports	2.43
2015	Coal Exports	1.85
2016	Coal Exports	1.51

  
数据来源：http://www.eia.gov