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. 2019 Nov 21;14:14. doi: 10.1186/s13021-019-0130-z

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — The proportion of all three industries and coal between 1971 and 2015 (different color rectangular represents the proportion of primary industry, secondary industry and tertiary industry respectively. The line represents the proportion of coal)

Source: China statistical yearbook 2017 [36]