Libellés | 1970 | 1980 | 1990 | 2000 | 2010 | 2013 |
Unit salary expenditure | 0.372 | 0.305 | 0.187 | 0.150 | 0.125 | 0.048 |
Unit operating expenditure | 0.037 | 0.065 | 0.006 | 0.029 | 0.024 | 0.058 |
Unit investment expenditure | 0.003 | 0.009 | 0.007 | 0.012 | 0.039 | 0.047 |
Unit costs | 0.412 | 0.379 | 0.200 | 0.191 | 0.188 | 0.152 |