Use of WHT service time

Year	Number of nights	Number of programs	Number of obs/treated	Observed (h)	Discretionnary (h)	Bad weather (h)	Statistics by grade (%)
							1	2	3	4-5
2007	29	37	53/53	94.12	24	28	20.2	63.3	16.5	0
2006	41	43	64/64	113.62	33	180	28.2	59.5	12.3	0
2005	42	38	51/51	118.55	54	235	10.8	52.6	13.8	22.8
2004	38	40	69/68	103.15	69	85	4.8	70.7	13.3	11.3
2003	50	57	93/93	208.63	50	95	18.5	57.8	13.8	10.0
2002	4	6	6/ 6	10.6	10	62	0	85.9	14.1	0