Year        1        2        3        4        5        6        7        8        9       10       11       12    Total
    2018       1.6      3.2      1.0                        0.2      0.0      2.2      0.0                                    
    2017       1.0      2.2      5.2     11.0      5.0      0.2      0.8      1.6      3.2      0.8      0.0      0.2     31  
    2016       0.2      3.0      8.8      3.6      0.0                                                   2.2      0.2         
    2015                        12.2      6.6      0.0      9.4     16.2     18.8     10.4      7.6      0.2      8.4         
    2014       2.6      1.4      8.0      1.6      9.4      1.0      2.0      1.4               1.6      7.4      6.6         
    2013                0.0      0.0      5.2     10.4     16.0      1.6     11.0     11.6      2.4      1.6      5.0         
 Average       1        2        6        6        5        5        4        7        6        3        2        4       31   
 Std Dev       1        1        5        4        5        7        7        8        6        3        3        4