Año | Dato |
1985
|
35,61
|
1986
|
31,90
|
1987
|
31,81
|
1988
|
31,59
|
1989
|
31,05
|
1990
|
30,44
|
1991
|
26,70
|
1992
|
26,56
|
1993
|
26,76
|
1994
|
26,86
|
1995
|
27,63
|
1996
|
28,12
|
1998
|
27,47
|
1999
|
27,41
|
2000
|
27,37
|
2001
|
26,95
|
2002
|
27,68
|
2003
|
27,30
|
2004
|
27,80
|
2005
|
28,55
|
2006
|
28,85
|
2007
|
29,71
|
2008
|
30,25
|
2009
|
30,65
|
2010
|
30,79
|
2011
|
30,58
|
2012
|
30,91
|
2013
|
30,63
|
2014
|
30,36
|
2015
|
29,81
|
2016
|
29,09
|
2017
|
29,06
|
2018
|
29,00
|
2019
|
29,78
|
2020
|
29,85
|
2021
|
30,44
|
2022
|
30,47
|
2023
|
30,58
|
|
|
|