Year        1        2        3        4        5        6        7        8        9       10       11       12    Total
    2019     107.4     12.2     18.0     33.5     25.6      9.7     17.3      6.9                                             
    2018     105.2     49.0     13.2     54.3      4.1     18.0      0.2      0.0     22.1     57.7    112.0    136.6    572  
    2017      27.2     64.7     80.0     37.1     23.9     17.5      2.5      1.8     19.8     88.6     98.3     68.6    530  
    2016      55.3    103.1     60.0     10.1      7.1     27.7      7.6      7.1     30.5    105.9     81.0     96.0    591  
    2015      37.6     30.0     69.3     19.1      1.5      3.8      9.9     26.9     39.9     85.3    127.7    129.8    581  
    2014      88.1    126.5     73.9     45.2     20.6      4.8      6.3     14.7     43.4     88.6     85.9     75.4    674  
    2013      57.6     43.7     84.1     58.9     39.4      9.9      0.2      0.0    144.0     18.8     30.0     37.1    524  
    2012      84.8     66.0     61.2     32.0     21.8     35.5     15.2      2.5      1.5    122.7     89.9     93.2    627  
    2011     115.3     54.9     59.7     67.0     53.1      6.9     15.0      7.9     21.8     52.8    109.7     42.7    607  
    2010      55.3     22.3     59.4     28.7     28.4     13.5      1.0      0.0     58.7     38.6     60.7    131.6    498  
    2009      72.6     22.1     42.7     50.3     37.3      5.3      9.6     16.8     36.8    103.1    173.0     39.4    609  
    2008      54.4     39.3     49.0     36.6     10.1     11.7      5.8     30.7      0.2     30.0    104.4     53.8    426  
    2007     172.2     68.6     89.4     23.6      8.9     21.6     25.4     14.0     12.4     45.4     52.1    113.3    647  
    2006                                           2.8     17.8      2.5      4.6     28.4     36.6    250.7     84.5         
 Average      79       54       58       38       20       15        8       10       35       67      106       85      573   
 Std Dev      39       33       23       16       16        9        8       10       37       33       56       36       69