| Year | Value (%) |
|---|---|
|
2021 |
18.44 |
|
2020 |
18.44 |
|
2019 |
18.55 |
|
2018 |
18.46 |
|
2017 |
18.51 |
|
2016 |
18.56 |
|
2015 |
18.61 |
|
2014 |
18.61 |
|
2013 |
18.62 |
|
2012 |
18.58 |