| Series | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | (2.5) | 5.0 | 10.2 | (3.7) | 9.7 | 17.1 | 10.8 | (3.6) | 10.8 | 25.6 | (22.9) |
| B | (3.0) | 4.4 | 9.5 | (4.3) | 9.1 | 16.4 | 10.2 | (4.2) | 10.2 | 25.0 | (23.3) |
| C | (3.0) | 4.4 | 9.5 | (4.2) | 9.2 | 16.5 | 10.2 | (4.2) | 10.2 | 25.0 | (23.3) |
| F | (1.4) | 6.4 | 11.3 | (2.7) | 10.9 | 18.3 | 11.6 | (2.6) | 12.0 | 27.0 | (21.4) |
| T8A | (2.5) | 5.0 | 10.1 | (3.7) | 9.7 | 17.1 | 10.8 | (3.7) | 10.7 | 25.8 | (24.1) |
| T8B | (3.1) | 4.4 | 9.6 | (4.2) | 9.1 | 16.4 | 10.2 | (4.2) | 10.2 | 25.2 | (24.4) |
| T8C | (3.0) | 4.5 | 9.6 | (4.1) | 9.2 | 16.5 | 10.2 | (4.2) | 10.2 | 25.2 | (24.4) |
| L | (3.1) | 4.4 | 9.5 | (4.3) | 9.0 | 16.3 | 9.9 | 0.2 | |||
| American A | (8.1) | 4.1 | 6.7 | 10.7 | 7.4 | ||||||
| American F | (7.0) | 5.2 | 8.0 | 11.9 | 8.4 |
