For the Years Ended December 31
Cdn$ millions, except per share amounts	2007	2006
Common Shares
Balance at Beginning of Year	821	732
Exercise of Tandem Options for Shares	32	16
Issue of Common Shares	24	32
Previously Recognized Liability Relating to Stock Options Exercised	40	41
Balance at End of Year	917	821
Contributed Surplus
Balance at Beginning of Year	4	2
Stock Based Compensation Expense	1	2
Modification of Stock Option Plan to Tandem Option Plan	(2)	-
Balance at End of Year	3	4
Retained Earnings
Balance a Beginning of Year	3,972	3,423
Net Income	1,086	601
Dividends on Common Shares	(53)	(52)
Transition Adjustment for Inventory Standard	(22)	-
Balance at End of Year	4,983	3,972
Accumulated Other Comprehensive Loss
Balance at Beginning of Year	(161)	(161)
Opening Cumulative Foreign CTA	-	-
Opening Derivatives Designated as Cash Flow Hedges	61	-
Other Comprehensive Loss	(193)	-
Balance at End of Year	(293)	(161)

See accompanying notes to Consolidated Financial Statements.
For more historical information, see our statistical supplement