V H S = Very hight season ( 8 July to 26 August)
H S = Hight season ( 24 June au 8 July and 26 August to 2 Septembre) 
M S = Middle season ( 13 May to 24 June and 2 September to 23 September )
  L S = Low season (1 Junuary to 13 May and 23 September to 31 December )