| 1 January 2026 to 30 June 2026 | 50.78% | 38.56% | 5.78% | 4.88% | N/A | N/A |
| 1 July 2025 – 31 December 2025 | 49.64% | 40.14% | 5.29% | 4.93% | N/A | N/A |
| 1 January 2025 – 30 June 2025 | 48.95% | 41.22% | 4.80% | 5.03% | N/A | N/A |
| 1 July 2024 – 31 December 2024 | 49.89% | 40.03% | 5.06% | 5.02% | N/A | N/A |
| 1 January 2024 – 30 June 2024 | 52.63% | 36.89% | 5.46% | 5.02% | N/A | N/A |
| 1 July 2023 – 31 December 20231 | 28.96% | 19.14% | 3.19% | 2.26% | 14.22% | 32.23% |
| 1 January 2023 – 30 June 2023 | 32.40% | 18.74% | 3.83% | 2.33% | 12.27% | 30.43% |
| 1 July 2022 – 31 December 2022 | 34.72% | 19.17% | 4.28% | 2.44% | 10.98% | 28.41% |
| 1 January 2022 – 30 June 2022 | 35.27% | 19.57% | 5.04% | 2.28% | 9.50% | 28.34% |
| 1 July 2021 – 31 December 2021 | 37.45% | 21.34% | 5.23% | 2.24% | 8.86% | 24.88% |
| 1 January 2021 – 30 June 2021 | 39.82% | 22.09% | 5.75% | 2.12% | 8.08% | 22.14% |
| 1 July 2020 – 31 December 2020 | 44.23% | 23.01% | 5.99% | 1.78% | 5.31% | 19.68% |
| 1 January 2020 – 30 June 2020 | 46.35% | 22.66% | 5.91% | 1.93% | 5.10% | 18.05% |
| 1 July 2019 – 31 December 2019 | 48.23% | 22.11% | 5.86% | 1.93% | 4.85% | 17.02% |
| 1 January 2019 – 30 June 2019 | 50.61% | 21.37% | 5.70% | 2.04% | 4.49% | 15.79% |
| 1 July 2018 – 31 December 2018 | 51.46% | 21.73% | 5.80% | 2.21% | 4.22% | 14.58% |
| 1 January 2018 – 30 June 2018 | 55.23% | 19.54% | 5.82% | 2.10% | 3.68% | 13.63% |
| 1 July 2017 – 31 December 2017 | 55.29% | 19.39% | 6.46% | 2.22% | 3.43% | 13.21% |
| 1 January 2017 – 30 June 2017 | 55.35% | 20.77% | 6.25% | 2.27% | 3.14% | 12.22% |
| 1 July 2016 – 31 December 2016 | 54.14% | 20.86% | 7.32% | 2.23% | 3.06% | 12.39% |
| 1 January 2016 – 30 June 2016 | 55.58% | 20.99% | 7.63% | 2.22% | 2.77% | 10.81% |
| 1 July 2015 – 31 December 2015 | 54.07% | 22.56% | 8.15% | 2.07% | 2.52% | 10.63% |
| 1 January 2015 – 30 June 2015 | 54.78% | 22.50% | 8.20% | 2.00% | 2.35% | 10.17% |
| 1 July 2014 – 31 December 2014 | 54.39% | 23.19% | 8.68% | 1.93% | 2.14% | 9.67% |
| 1 January 2014 – 30 June 2014 | 55.50% | 22.74% | 8.47% | 1.82% | 2.00% | 9.47% |
| 14 November 2013 – 31 December 2013 | 53.65% | 23.31% | 10.36% | 1.75% | 1.88% | 9.05% |
| 1 July 2013 – 13 November 2013 | 56.90% | 13.55% | 16.87% | 1.75% | 1.88% | 9.05% |
| 1 January 2013 – 30 June 2013 | 56.24% | 13.6% | 18.07% | 1.61% | 1.76% | 8.72% |
| 1 July 2012 – 31 December 2012 | 57.31% | 13.38% | 17.62% | 1.54% | 1.77% | 8.38% |
| 6 March 2012 – 30 June 2012 | 56.89% | 14.03% | 17.4% | 1.49% | 1.51% | 8.64% |
| 1 January 2012 – 5 March 20122 | 69.7% | 5.3% | 24.1% | 0.9% | | |
| 1 July 2011 – 31 December 2011 | 69.7% | 5.3% | 24.1% | 0.9% | | |
| 1 January 2011 – 30 June 2011 | 71.5% | 5.37% | 22.72% | 0.4% | | |
| 1 July 2010 – 31 December 2010 | 74.95% | 5.21% | 18.99% | 0.85% | | |
| 1 January 2010 – 30 June 2010 | 75.17% | 4.94% | 19.04% | 0.85% | | |
| 1 July 2009 – 31 December 2009 | 75.22% | 4.93% | 19.00% | 0.85% | | |
| 1 January 2009 – 30 June 2009 | 69.9% | 6.4% | 23.3% | 0.4% | | |
| 1 July 2008 – 31 December 2008 | 73.4% | 3.4% | 19.8% | 3.4% | | |
| 1 January 2008 – 30 June 2008 | 71.7% | 4.8% | 21.2% | 2.2% | | |
| 1 July 2007 – 31 December 2007 | 74.5% | 5.7% | 19.0% | 0.8% | | |
| 1 January 2007 – 30 June 2007 | 74.3% | 6.0% | 18.8% | 0.9% | | |
| 1 July 2006 – 31 December 2006 | 76.0% | 5.1% | 18.1% | 0.9% | | |
| 1 April 2006 – 30 June 2006 | 78.6% | 5.7% | 14.8% | 0.9% | | |
| 1 January 2006 – 31 March 20063 | 93.3% | 6.7% | | | | |
| 1 July 2005 – 31 December 2005 | 93.2% | 8.6% | | | | |
| 1 January 2005 – 30 June 2005 | 94.0% | 6.0% | | | | |
| 1 July 2004 – 31 December 2004 | 93.9% | 6.1% | | | | |
| 1 January 2004 – 30 June 2004 | 94.1% | 5.9% | | | | |
| 1 July 2003 – 31 December 2003 | 93.7% | 6.3% | | | | |
| 26 October 2002 – 30 June 2003 | 94.0% | 6.0% | | | | |
| 25 October 20024 | 95.5% | 4.5% | | | | |
| 24 August 2002 – 24 October 2002 | 95.25% | 4.8% | | | | |
| 23 August 2002 | 94.8% | 5.2% | | | | |
| 17 December 2001 – 22 August 20025 | 95.2% | 4.8% | | | | |