JanFebMarAprMayJunJulAugSepOctNovDec
11.59.111.916.7        
23.613.18.713.4        
34.310.610.911.8        
45.29.98.314.5        
54.110.88.39.8        
63.77.88.18.6        
73.84.57.38.2        
83.83.310.312.0        
91.70.810.612.5        
104.73.511.711.6        
119.93.211.410.5        
1210.93.810.311.9        
1311.04.29.212.5        
1410.59.411.213.1        
157.311.613.311.0        
1610.612.114.911.2        
177.411.714.1         
1810.711.015.1         
1911.610.911.5         
2011.411.911.1         
218.011.312.1         
229.513.013.3         
235.911.411.2         
246.212.314.1         
256.612.414.6         
269.311.611.6         
2710.612.412.0         
2814.213.211.9         
2911.313.2         
3010.618.6         
314.316.4     
Avg: 7.69.311.8* 11.8        
Hi: 14.213.218.6* 16.7        
Lo: 1.50.87.3* 8.2        
Note:  *Incomplete dataset.
AvgJanFebMarAprMayJunJulAugSepOctNovDec
20217.69.311.8* 11.8        
202010.111.111.616.418.819.921.222.319.814.712.89.4
20198.2* 11.2* 12.814.016.619.222.721.719.414.910.810.5
201810.17.69.014.018.622.424.821.919.415.312.011.4
20178.710.112.514.417.420.421.620.518.016.211.79.6
201610.29.611.212.817.919.621.722.120.115.210.810.6
20159.98.411.115.215.819.920.619.918.115.313.413.3
20149.99.912.114.116.320.723.320.120.816.312.69.7
20138.17.17.511.515.118.623.822.019.016.410.410.4
201210.18.613.412.117.017.319.420.417.914.310.99.5
20117.410.511.917.416.418.620.019.719.116.913.810.5
20105.47.310.113.916.221.021.220.318.215.110.04.1
20097.18.312.014.217.120.019.720.319.116.012.57.5
200810.610.610.812.818.419.220.219.518.314.311.07.7
2007         * 15.311.99.4
Avg8.8* 9.2* 11.3* 13.917.019.821.620.819.0* 15.411.89.5