Study the table below, which shows the average annual coastal erosion rate at 12 monitoring sites along a stretch of coastline.
| Monitoring Site | Average annual coastal erosion rate (cm/year) |
|---|---|
| Site A | 125 |
| Site B | 142 |
| Site C | 98 |
| Site D | 115 |
| Site E | 154 |
| Site F | 110 |
| Site G | 131 |
| Site H | 104 |
| Site I | 122 |
| Site J | 148 |
| Site K | 119 |
| Site L | 136 |
Calculate the median annual coastal erosion rate for these sites. You must show your working.