| YEAR | RESULTS |
| 1991 | Very good |
| 1992 | Very good |
| 1993 | Very good |
| 1994 | Good |
| 1995 | Good |
| 1996 | Very good |
| 1997 | Regular |
| 1998 | Excellent |
| 1999 | Good |
| 2000 | Very good |
| 2001 | Excellent |
| 2002 | Very good |
| 2003 | Good |
| 2004 | Excellent |
| 2005 | Excellent |
| 2006 | Very good |
| 2007 | Excellent |
| 2008 | Very good |
| 2009 | Very good |
| 2010 | Excellent |
| 2011 | Excellent |
| 2012 | Very good |
| 2013 | Very good |
| 2014 | Very good |
| 2015 | Very good |
| 2016 | Very good |
| 2017 | Very good |
| 2018 | Very good |
| 2019 | Excellent |