JanFebMarAprMayJunJulAugSepOctNovDec
19.91.89.4         
25.33.613.7         
33.25.910.9         
45.49.310.2         
57.07.512.2         
611.28.711.9         
711.77.17.9         
88.111.78.4         
94.89.28.2         
109.77.37.0         
118.78.49.7         
1210.711.38.8         
1311.211.79.7         
148.314.611.1         
1510.214.611.5         
169.613.811.7         
174.313.58.9         
183.910.19.5         
192.89.013.2         
205.911.619.8         
215.516.615.1         
224.016.413.9         
233.415.211.6         
245.715.6          
2511.117.7          
269.719.2          
276.317.4          
284.49.9          
293.3          
303.3          
31-1.4      
Avg: 6.711.4* 11.1         
Hi: 11.719.2* 19.8         
Lo: -1.41.8* 7.0         
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
20196.711.4* 11.1         
20187.45.88.013.320.5* 22.9* 26.822.218.414.810.39.0
2017* 7.5 * 13.2* 14.718.620.922.120.717.815.810.1* 7.6
2016   * 13.3* 17.6* 20.1* 22.5* 22.520.8* 14.6* 9.4* 9.4
2015* 8.4* 7.910.7* 15.8* 15.8* 20.421.421.418.1* 17.0 * 13.1
20148.1* 9.412.9* 15.5* 16.320.524.520.419.9* 15.5* 11.88.4
2013* 8.0* 7.3* 7.2* 12.8* 15.8* 19.9* 25.122.218.6* 16.0* 9.9* 9.6
2012* 8.48.4* 20.111.8* 14.3* 17.7* 19.9* 21.3* 18.6* 13.1* 8.8* 7.5
20117.3* 10.1* 12.2* 18.4* 17.420.321.9* 21.3* 20.4* 16.6* 12.3* 8.4
2010* 4.5* 6.613.3* 15.7* 16.3* 21.521.820.5* 18.914.68.2* 3.3
2009* 6.37.7* 12.7* 16.4* 18.1* 21.3* 22.222.9* 20.5* 16.6* 11.3* 6.0
2008* 9.3* 10.1* 11.215.1* 21.3* 21.0* 24.3* 23.4* 20.2* 12.3* 9.9* 6.5
2007    * 17.6* 17.4* 20.2* 21.2* 17.3* 15.511.2* 7.4
Avg