The table below shows the number of hikers (in thousands) visiting a national park each year.
| Year | Hikers (thousands) |
|---|---|
| 2010 | 30 |
| 2011 | 35 |
| 2012 | 33 |
| 2013 | 40 |
| 2014 | 55 |
| 2015 | 53 |
According to the data, between which two consecutive years did the park see the greatest increase in hikers?
2010–2011
2011–2012
2013–2014
2014–2015
