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