An Improved Nonhomogeneous Discrete Grey Model and Its Application

Table 4

Natural gas demand of China from 2003 to 2013 (billion cubic meters).

Year	Raw data	Year	Raw data
2003	35.0	2009	85.2
2004	41.5	2010	94.8
2005	49.3	2011	103.1
2016	58.6	2012	107.2
2007	69.2	2013	119.3
2008	80.3