Year        1        2        3        4        5        6        7        8        9       10       11       12    Total
    2011                                 10.7     13.5                                                                        
    2010     111.0     55.1     63.0     37.8      8.4               0.0      4.6      5.6      3.8      2.0                  
    2009       5.8      3.5     11.2      8.1      9.7      8.9      9.1     11.7      8.1     23.6    179.3     49.3    328  
    2008      54.1      8.6     61.5     19.5     13.0     27.4      9.9     11.1      1.3      5.1     10.4     17.8    240  
    2007      76.4     32.2     58.4     37.8     22.9     55.4     19.3     23.4     37.9     61.5     61.2     75.7    562  
    2006                                                             0.0      0.0     29.5     28.9    168.1     68.3         
 Average      62       25       49       23       14       31        8       10       16       25       84       53      376   
 Std Dev      44       24       25       14        6       23        8        9       16       23       85       26      166