| Year | Answer | % Correct |
|---|---|---|
| 2005 | R25 | 89%
|
| 2006 | R26 | 86%
|
| 2008 | R28 | 86%
|
| 2009 | R29 | 86%
|
| 2010 | R30 | 86%
|
| 2007 | R27 | 84%
|
| 2011 | R31 | 81%
|
| 2003 | R23/R23B | 78%
|
| 2004 | R24/R24B | 78%
|
| 2020 | R.S.20 | 70%
|
| 2016 | R.S.16 | 68%
|
| 2017 | R.S.17 | 68%
|
| 2018 | R.S.18 | 68%
|
| 2019 | R.S.19 | 68%
|
| 1979 | RS01/RS10 | 54%
|
| 1977 | RS01 | 49%
|
| 1978 | RS01 | 49%
|
| 1980 | RE20 | 35%
|
| 1981 | RE20B/RE30 | 35%
|
| 1983 | RE30C/RE40 | 35%
|
| 1984 | RE50 | 35%
|
| 1985 | RE60/RE60B | 35%
|
| 1982 | RE30B | 30%
|
| 2002 | R202 | 27%
|