1979
15.84
16.57
16.85
8
16.54
8.7
1980
15.59
16.46
16.51
8.75
16.5
8.61
1981
15.43
16.08
16.14
8.17
16.45
8.52
1982
15.72
16.46
16.53
8.25
16.41
8.43
1983
15.45
16.42
16.53
8.45
16.37
8.34
1984
14.91
15.67
15.98
7.88
16.33
8.25
1985
15.11
15.83
16.32
7.8
16.29
8.16
1986
15.27
16.21
16.3
8.15
16.25
8.06
1987
15.51
16.45
16.17
8.15
16.2
7.97
1988
15.58
16
16.35
8.16
16.16
7.88
1989
15.22
15.89
15.86
7.75
16.12
7.79
1990
15.14
16
16.34
6.94
16.08
7.7
1991
14.79
15.65
15.8
7.24
16.04
7.61
1992
15.3
15.97
16.04
8.24
15.99
7.52
1993
15.46
16.14
16.22
7.32
15.95
7.43
1994
15.19
16.02
15.97
8.02
15.91
7.34
1995
15.06
15.64
15.66
6.82
15.87
7.24
1996
14.61
15.55
15.53
8.42
15.83
7.15
1997
14.97
15.86
15.9
7.42
15.79
7.06
1998
15.12
16.1
16.02
7.5
15.74
6.97
1999
14.84
15.66
15.71
7.18
15.7
6.88
2000
14.72
15.61
15.64
7.28
15.66
6.79
2001
14.76
15.68
15.85
7.59
15.62
6.7
2002
14.89
15.77
15.75
6.59
15.58
6.61
2003
14.78
15.55
15.84
6.89
15.53
6.52
2004
14.43
15.27
15.31
6.64
15.49
6.42
2005
14.04
14.77
15.04
6.19
15.45
6.33
2006
13.91
14.67
14.77
6.56
15.41
6.24
2007
14.14
14.91
14.91
4.96
15.37
6.15
2008
14.24
15.27
15.44
5.39
15.33
6.06
2009
14.22
15.06
15.26
5.89
15.28
5.97
2010
13.97
14.88
15.41
5.55
15.24
5.88
2011
13.79
14.63
14.87
5.12
15.2
5.79
2012
14.04
14.9
15.47
4.15
15.16
5.69
2013
15.43
6.16
15.12
5.6
2014
15.33
6.3
15.07
5.51