Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year ended December 31,															Three months ended March 31,
	2012			2013			2014			2015			2016			2017
Earnings:
Income before income taxes		11,965,437			12,216,707			14,484,406			37,906,623			14,509,207			2,175,367
Add-back of loss from equity method investments		67,745			(24,673	)		19,943			(3,867	)		1,025,727			76,128
Add-back of fixed charges		206,355			553,605			794,746			1,465,306			1,816,076			505,420
Less: interest capitalized		—			—			(36,289	)		(5,774	)		(43,032	)		(10,979	)
Less: accretion of the redeemable equity interests of the consolidated subsidiaries		(36,534	)		(68,761	)		(52,683	)		(329,180	)		(557,918	)		(162,435	)
		12,203,003			12,676,878			15,210,123			39,033,108			16,750,060			2,583,501
Fixed charges:
Interest expenses		107,857			447,084			628,571			1,041,394			1,157,562			323,366
Interest capitalized		—			—			36,289			5,774			43,032			10,979
Estimated interest portion of rental expenses		26,663			37,760			77,203			88,958			57,564			8,640
Accretion of the redeemable equity interests of the consolidated subsidiaries		71,835			68,761			52,683			329,180			557,918			162,435
		206,355			553,605			794,746			1,465,306			1,816,076			505,420
Ratio of earnings to fixed charges		59.1			22.9			19.1			26.6			9.2			5.1