| year | geo | efficiency_rate |
|---|---|---|
| 1990 | EEA32 | 50.0 |
| 1991 | EEA32 | 45.4 |
| 1992 | EEA32 | 48.5 |
| 1993 | EEA32 | 48.5 |
| 1994 | EEA32 | 48.1 |
| 1995 | EEA32 | 45.4 |
| 1996 | EEA32 | 47.5 |
| 1997 | EEA32 | 48.0 |
| 1998 | EEA32 | 47.9 |
| 1999 | EEA32 | 49.5 |
| 2000 | EEA32 | 55.4 |
| 2001 | EEA32 | 56.4 |
| 2002 | EEA32 | 55.8 |
| 2003 | EEA32 | 56.7 |
| 2004 | EEA32 | 57.6 |
| 2005 | EEA32 | 59.7 |
| 2006 | EEA32 | 57.4 |
| 2007 | EEA32 | 56.1 |
| 2008 | EEA32 | 57.0 |
| 2009 | EEA32 | 57.1 |
| 2010 | EEA32 | 57.6 |
| 2011 | EEA32 | 56.1 |
| 2012 | EEA32 | 54.6 |