Table R4.1      Reserves and production changes in crude oil (106 m3)
	2017	2016	Change
Initial established reservesa
Light-medium	2623.4	2610.0	+13.4
Heavy	443.0	436.6	+6.4
Total	3066.4	3046.6	+19.8
Cumulative productionb
Light-medium	2425.7	2407.5	+18.2
Heavy	377.5	371.0	+6.5
Total	2803.2	2778.5	+24.7
Remaining established reservesa
Light-medium	197.8	202.3	-4.5
Heavy	65.5	65.5	0.0
Total	263.3	267.8	-4.5
	(1 657 106 bbl)c	(1 685 106 bbl)c	(-28 106 bbl)c
Annual production
Light-medium	19.2	18.8	+0.4
Heavy	6.5	6.8	-0.3
Total	25.7	25.6	+0.1
a Any discrepancies are due to rounding.
b Change in cumulative production is a combination of annual production and all adjustments to previous production records.
c bbl = barrels.