| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| 2019 | 25.4 | 118.5 | 149.9 | 159.3 | 219.5 | 159.3 | 225.6 | 151.1 | 140.7 | 85.6 | 34.7 | 25.4 | 1495.0 |
| 2018 | 56.7 | 117.3 | 120.9 | 146.7 | 175.8 | 208.0 | 226.7 | 127.8 | 146.5 | 105.9 | 73.0 | 20.5 | 1525.8 |
| 2017 | 59.0 | 53.1 | 80.3 | 216.2 | 166.0 | 175.3 | 135.9 | 163.2 | 119.0 | 66.5 | 51.5 | 34.5 | 1320.5 |
| 2016 | 54.8 | 64.1 | 139.9 | 183.8 | 202.4 | 131.8 | 160.9 | 162.3 | 102.8 | 124.9 | 56.5 | 47.7 | 1431.9 |
| 2015 | 51.3 | 137.5 | 147.2 | 227.5 | 161.7 | 229.1 | 166.3 | 129.9 | 164.4 | 102.5 | 36.7 | 18.7 | 1572.8 |
| 2014 | 43.0 | 85.1 | 91.6 | 162.9 | 190.0 | 265.9 | 204.7 | 200.2 | 181.0 | 78.4 | 78.0 | 54.0 | 1634.8 |
| 2013 | 63.7 | 80.2 | 117.9 | 117.9 | 227.2 | 185.2 | 278.3 | 173.3 | 114.4 | 76.5 | 60.1 | 44.5 | 1539.2 |
| 2012 | 55.1 | 74.7 | 159.4 | 153.8 | 179.3 | 108.6 | 176.9 | 136.3 | 147.1 | 91.8 | 61.9 | 37.4 | 1382.3 |
| 2011 | 83.0 | 58.5 | 147.4 | 239.0 | 169.8 | 202.7 | 175.8 | 149.4 | 138.9 | 92.4 | 74.6 | 28.8 | 1560.3 |
| 2010 | 103.9 | 95.9 | 139.2 | 231.0 | 209.9 | 286.0 | 117.7 | 154.6 | 144.9 | 147.1 | 84.8 | 90.9 | 1805.9 |
| 2009 | 74.5 | 74.5 |
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Max | 103.9 | 137.5 | 159.4 | 239.0 | 227.2 | 286.0 | 278.3 | 200.2 | 181.0 | 147.1 | 84.8 | 90.9 | 1805.9 |
| Average | 59.6 | 88.5 | 129.4 | 183.8 | 190.2 | 195.2 | 186.9 | 154.8 | 140.0 | 97.2 | 61.2 | 43.4 | 1394.8 |
| Min | 25.4 | 53.1 | 80.3 | 117.9 | 161.7 | 108.6 | 117.7 | 127.8 | 102.8 | 66.5 | 34.7 | 18.7 | 74.5 |
