| 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
X0 | 10.3 | 10.63 | 11.13 | 11.73 | 13.71 | 14.3 | 14.4 | 14.9 | 16.3 |
X1 | 8.96 | 9.57 | 10.28 | 10.92 | 12.14 | 13.35 | 14.58 | 15.33 | 15.58 |
X2 | 14.61 | 15.64 | 16.4 | 17.02 | 17.82 | 18.8 | 20.65 | 21.33 | 22.64 |
X3 | 3465 | 4929 | 4987 | 5016 | 5011 | 5144 | 5298 | 5610 | 5905 |
X4 | 4589 | 5170 | 5556 | 6362 | 7596 | 8611 | 9496 | 10,183 | 10,968 |
X5 | 35.1 | 35.4 | 36 | 35 | 33.6 | 33.8 | 37.2 | 36.4 | 39.1 |
X6 | 30.2 | 28.8 | 26.8 | 26.2 | 25.1 | 24.7 | 24.1 | 23.4 | 25.7 |
X7 | 89.3 | 89.6 | 89.6 | 87.9 | 87.6 | 97.9 | 87.5 | 87.1 | 87.2 |