EXHIBIT A

Response to Item 5(c) — Trading History

Trade Date	Amount ++	Price Per Share+
Oct. 5	200	$56.83
Oct. 5	200	56.85
Oct. 5	2,200	56.84
Oct. 5	300	56.98
Oct. 5	300	56.92
Oct. 5	700	57.08
Oct. 5	200	57.18
Oct. 5	900	57.25
Oct. 5	1,300	57.89
Oct. 5	400	57.99
Oct. 5	700	57.98
Oct. 5	2,900	57.96
Oct. 5	400	57.73
Oct. 5	200	57.6
Oct. 5	5,000	57.91
Oct. 5	3,100	57.92
Oct. 5	400	57.76
Oct. 5	1,600	57.71
Oct. 5	10,200	57.84
Oct. 5	3,700	57.87
Oct. 5	3,300	57.81
Oct. 5	5,800	57.86
Oct. 5	4,300	57.93
Oct. 5	900	57.67
Oct. 5	900	57.97
Oct. 5	3,000	57.82
Oct. 5	12,700	57.88
Oct. 5	54,600	57.9
Oct. 5	10,300	57.69
Oct. 5	43,800	57.7
Oct. 5	10,600	57.63
Oct. 5	5,500	57.64
Oct. 5	7,800	57.68
Oct. 5	107,000	58
Oct. 5	12,800	57.95
Oct. 5	3,900	57.94
Oct. 5	15,000	57.85
Oct. 5	5,400	57.83
Oct. 5	12,800	57.8
Oct. 5	2,700	57.79
Oct. 5	1,200	57.78
Oct. 5	11,300	57.75
Oct. 5	1,500	57.72
Oct. 5	1,000	57.74
Oct. 5	400	57.65
Oct. 5	1,000	57.66
Oct. 5	600	57.77
Oct. 5	100	56.8
Oct. 5	100	56.82

Trade Date	Amount ++	Price Per Share+
Oct. 5	200	57.17
Oct. 5	100	57.19
Oct. 5	100	57.41
Oct. 5	100	57.62
Oct. 5	100	57.61
Oct. 8	2,119,000*	62.50
Oct. 8	500.00	57.95
Oct. 8	800.00	57.9
Oct. 8	51,800.00	58
Oct. 8	200.00	57.98
Oct. 8	100.00	57.99
Oct. 8	300.00	57.94
Oct. 8	200.00	57.93
Oct. 9	2500	59.79
Oct. 9	4900	59.78
Oct. 9	7100	59.76
Oct. 9	1000	59.74
Oct. 9	21800	59.75
Oct. 9	300	59.92
Oct. 9	1800	59.98
Oct. 9	1600	59.94
Oct. 9	10900	59.95
Oct. 9	200	59.82
Oct. 9	4300	59.83
Oct. 9	3300	59.84
Oct. 9	300	59.81
Oct. 9	30800	59.8
Oct. 9	91800	59.85
Oct. 9	4800	59.86
Oct. 9	2800	59.87
Oct. 9	9600	59.88
Oct. 9	2800	57.94
Oct. 9	12500	59.96
Oct. 9	31800	60
Oct. 9	1300	59.99
Oct. 9	1400	59.91
Oct. 9	43800	59
Oct. 9	200	58.53
Oct. 9	1000	58.54
Oct. 9	300	57.97
Oct. 9	1800	57.96
Oct. 9	1600	57.95
Oct. 9	2900	58
Oct. 9	6500	57.9
Oct. 9	1500	57.82
Oct. 9	2100	57.76
Oct. 9	35400	59.9
Oct. 9	3900	59.89
Oct. 9	1400	59.93
Oct. 9	11700	59.77
Oct. 9	200	57.92
Oct. 9	100	57.91
Oct. 9	1000	57.86

Trade Date	Amount ++	Price Per Share+
Oct. 9	300	57.75
Oct. 9	200	57.99
Oct. 9	7400	58.55
Oct. 9	300	58.94
Oct. 9	300	59.97
Oct. 9	100	59.72
Oct. 9	989,311*	62.5

(*)

Denotes privately negotiated transactions.  All other transactions were effected in open market transactions.

(+)

Price per share does not include brokerage fees and other commissions paid in connection with trade.

(++) All transactions relate to purchases of Class A Common Shares by DF.