Pursuant to the general principle of proportionality, any additional implementation period granted must be strictly proportional to what is necessary to achieve the necessary structural adjustment, mentioned by the Portuguese authorities with a view to the introduction of full competition, i.e. the further adjustment of Portugal Telecom's tariffs, which in most cases appear to be too high, the network penetration which appears to be too low (approximately 37 main lines per 100 inhabitants against a Community average of 48 in 1995) and low average spending for the usage of each single main line (in 1995, the average spending per 100 inhabitants was ECU 20 720 as opposed to ECU 33 275 in the UK).
