Common size	2011	2010	2009	2008	2007	2006
Net sales	100.00	100.00	100.00	100.00	100.00	100.00
Cost of sales	42.69	40.86	41.23	41.2	40.41	41.08
Gross profit	57.31	59.14	58.77	58.8	59.59	58.92
Selling, general and administrative expenses	34.41	34.79	34.46	34.84	35.7	35.21
Other (income) expense, net	(0.05)	1.93	0.72	3.61	4.04	5.49
Operating profit	22.95	22.42	23.59	20.35	19.84	18.22
Interest expense, net.	0.31	0.38	0.50	0.75	1.25	1.39
Income before income taxes	22.64	22.04	23.08	19.60	18.59	16.83
Provision for income taxes	7.38	7.18	7.44	6.31	5.50	5.30
Net income including interests	15.26	14.86	15.64	13.29	13.08	11.53
Less: Net income attributable to interests	0.74	0.71	0.69	0.52	0.49	0.47
Net income attributable to Dawning Company	14.53	14.15	14.95	12.77	12.6	11.06

Required:

analyse and interpret the Common-Size Income statement on the company performance for the period 2006 to 2011