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Observed trends Heating degree days

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T_Fig2.33a_hdd.jpg   T_Fig2.33b_hdd.jpg    
 
Annual average heating degree days for 1961-1990   Annual average heating degree days for 1971-2000    
 
     
 
T_Fig2.34a_hdd.jpg   T_Fig2.34b_hdd.jpg  
 
Percentage change in annual heating degree days from 1961-1990 to 1971-2000   Percentage change in annual heating degree days from 1961 to 2006