| year | geo | efficiency_rate |
|---|---|---|
| 1990 | EU28 | 75.6 |
| 1991 | EU28 | 79.2 |
| 1992 | EU28 | 78.4 |
| 1993 | EU28 | 83.5 |
| 1994 | EU28 | 81.1 |
| 1995 | EU28 | 84.2 |
| 1996 | EU28 | 83.4 |
| 1997 | EU28 | 81.5 |
| 1998 | EU28 | 84.4 |
| 1999 | EU28 | 83.9 |
| 2000 | EU28 | 84.8 |
| 2001 | EU28 | 85.7 |
| 2002 | EU28 | 84.1 |
| 2003 | EU28 | 79.9 |
| 2004 | EU28 | 79.5 |
| 2005 | EU28 | 82.2 |
| 2006 | EU28 | 80.6 |
| 2007 | EU28 | 81.4 |
| 2008 | EU28 | 81.6 |
| 2009 | EU28 | 81.4 |
| 2010 | EU28 | 81.3 |
| 2011 | EU28 | 79.3 |
| 2012 | EU28 | 81.1 |
| 2013 | EU28 | 82.6 |
| 2014 | EU28 | 82.5 |