Index Ratio Better Than Second-class Water
	2010	2011	2012	2013	2014	2015	Average
Bohai sea	55.1	57.1	67.3	63.2	73.4	71.4	64.58
Yellow sea	87	83.3	87	85.2	83.3	88.9	85.78
Liaoning Province	67.8		75	67.8	78.5	82.1	72.28
Shandong Provnice	95.1		95.1	95.1	95.1	92.7	94.62
Jiangsu Province	62.5		68.8	62.5	62.6	75.1	66.3
Average	86	70.2	92.4	87.26	91.1	97.06