Date 



Years Missing Data 



Years Drifted 

 # of Days 



9 



15 April 



51,53,58,60 



30 May 



46,51-53,58, 

 60, 63, 70, 73 



^ 



63 - 6 days 

 65 - 6 days 



69 - 6 days 



70 - 4 days 



71 - 3 days 



45 - 6 days 



49 - 7 days 



50 - 5 days 

 52 - 9 days 



4 days 

 6 days 



4 days 

 9 days 

 8 days 



5 days 

 4 days 



69 - 6 days 

 72 - 7 days 



56 

 59 

 60 

 62 

 64 

 65 

 67 



Table 2 



Data availability for 1945-1974. 'Years data missing' give periods when the IIP Annual Report did not 

 contain data within 9 days of the analysis date. Years drifted give those years when limit setting 

 icebergs were drifted using HP's operational model to bring the available data up to the analysis date. 



63 



