| 1st January 1986 – 31st December 2016 | 162∙6% | – |
| 1st January 1987 – 31st December 2016 | 154∙7% | – |
| 1st January 1988 – 31st December 2016 | 144∙5% | – |
| 1st January 1989 – 31st December 2016 | 131∙3% | – |
| 1st January 1990 – 31st December 2016 | 115∙0% | – |
| 1st January 1991 – 31st December 2016 | 93∙8% | – |
| 1st January 1992 – 31st December 2016 | 86∙2% | – |
| 1st January 1993 – 31st December 2016 | 79∙7% | – |
| 1st January 1994 – 31st December 2016 | 76∙5% | – |
| 1st January 1995 – 31st December 2016 | 72∙7% | – |
| 1st January 1996 – 31st December 2016 | 66∙3% | – |
| 1st January 1997 – 31st December 2016 | 62∙8% | – |
| 1st January 1998 – 31st December 2016 | 57∙2% | – |
| 1st January 1999 – 31st December 2016 | 52∙3% | – |
| 1st January 2000 – 31st December 2016 | 50∙6% | – |
| 1st January 2001 – 31st December 2016 | 45∙8% | – |
| 1st January 2002 – 31st December 2016 | 43∙4% | – |
| 1st January 2003 – 31st December 2016 | 41∙0% | – |
| 1st January 2004 – 31st December 2016 | 37∙2% | – |
| 1st January 2005 – 31st December 2016 | 33∙0% | – |
| 1st January 2006 – 31st December 2016 | 29∙5% | – |
| 1st January 2007 – 31st December 2016 | 25∙0% | – |
| 1st January 2008 – 31st December 2016 | 20∙3% | – |
| 1st January 2009 – 31st December 2016 | 14∙6% | 14∙6% |
| 1st January 2010 – 31st December 2016 | 16∙2% | 16∙2% |
| 1st January 2011 – 31st December 2016 | 12∙7% | 12∙7% |
| 1st January 2012 – 31st December 2016 | 7∙2% | 7∙2% |
| 1st January 2013 – 31st December 2016 | 4∙9% | 4∙9% |
| 1st January 2014 – 31st December 2016 | 2∙1% | 2∙1% |
| 1st January 2015 – 31st December 2016 | 0∙9% | 0∙9% |
| 1st January 2016 – 31st December 2016 | 1∙0% | 1∙0% |
| (all dates inclusive) | | |