| Month: | 2007 | 2008 | 2009 | 2010 | 2011 |
| January | 134 | 130 | 167 | 185 | 172 |
| February | 126 | 108 | 188 | 134 | 161 |
| March | 122 | 131 | 170 | 181 | 126 |
| April | 136 | 140 | 134 | 155 | 174 |
| May | 146 | 164 | 134 | 168 | 149 |
| June | 142 | 125 | 152 | 166 | 149 |
| July | 133 | 152 | 165 | 207 | 153 |
| August | 170 | 132 | 126 | 168 | 158 |
| September | 125 | 166 | 142 | 186 | 172 |
| October | 138 | 124 | 139 | 182 | 201 |
| November | 137 | 153 | 165 | 163 | 177 |
| December | 123 | 125 | 166 | 179 | 155 |
| Total | 1,632 | 1,650 | 1,848 | 2,070 | 1,964 |
| 2012 |