Table 2 Quarterly mean and variance for Seoul and Busan (1Q 2007 - 4Q 2010)

Region	Quarter	Number of data	Mean	Variance
Seoul	1Q	4	132.27	71.24
	2Q	4	134.87	49.68
	3Q	4	136.25	43.71
	4Q	4	133.15	60.08
	Total	16	134.14	47.47
Busan	1Q	4	107.98	98.52
	2Q	4	110.43	127.94
	3Q	4	112.85	155.36
	4Q	4	115.80	236.05
	Total	16	111.76	132.52