| Year | Value (%) |
|---|---|
|
2021 |
17.29 |
|
2020 |
16.17 |
|
2019 |
16.76 |
|
2018 |
17.91 |
|
2017 |
18.81 |
|
2016 |
19.2 |
|
2015 |
19.49 |
|
2014 |
19.83 |
|
2013 |
20.97 |
|
2012 |
21.4 |