| Period | Value | YoY Chg | Change % | Date | Report | Filed |
|---|---|---|---|---|---|---|
| Q4 2021 | 476M | +30M | +6.74% | 31 Dec 2021 | 20-F | 28 Apr 2022 |
| Q4 2020 | 446M | -20.3M | -4.36% | 31 Dec 2020 | 20-F | 28 Apr 2022 |
| Q4 2019 | 466M | +11.3M | +2.48% | 31 Dec 2019 | 20-F | 22 Apr 2021 |
| Q4 2018 | 455M | -62.8M | -12.1% | 31 Dec 2018 | 20-F | 28 Apr 2020 |
| Q4 2017 | 517M | -76M | -12.8% | 31 Dec 2017 | 20-F | 29 Apr 2019 |
| Q4 2016 | 593M | -10.3M | -1.71% | 31 Dec 2016 | 20-F | 23 Apr 2018 |
| Q4 2015 | 604M | -69.2M | -10.3% | 31 Dec 2015 | 20-F | 06 Apr 2017 |
| Q4 2014 | 673M | -59.1M | -8.07% | 31 Dec 2014 | 20-F | 07 Apr 2016 |
| Q4 2013 | 732M | -15.5M | -2.07% | 31 Dec 2013 | 20-F | 09 Apr 2015 |
| Q4 2012 | 748M | -42.6M | -5.39% | 31 Dec 2012 | 20-F | 11 Apr 2014 |
| Q4 2011 | 790M | -7.98M | -1% | 31 Dec 2011 | 20-F/A | 23 Apr 2013 |
| Q4 2010 | 798M | 31 Dec 2010 | 20-F | 12 Apr 2012 |