1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
|
2.48
2.96
3.50
2.72
4.00
3.99
2.61
2.94
3.50
3.85
4.32
5.76
5.00
6.11
9.19
8.98
5.56
5.33
10.78
12.92
7.13
5.48
6.56
10.03
13.78
18.90
|
1.29
2.45
2.84
0.63
2.43
1.98
1.17
2.15
2.90
3.36
3.90
4.42
3.79
4.60
6.30
4.90
3.71
3.29
5.94
8.53
5.20
4.65
4.61
6.70
10.01
9.03
|
|
|
|
|
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
|
19.10
14.94
9.56
11.64
8.58
8.14
7.29
8.76
9.85
8.29
6.91
4.06
3.09
5.45
6.05
5.56
5.56
5.56
5.42
6.54
5.98
1.75
1.26
2.16
4.16
5.25
|
12.37
8.95
8.51
8.38
7.53
5.85
6.10
6.58
8.45
7.31
4.43
2.92
2.96
3.05
5.53
5.22
5.19
4.68
4.63
5.45
1.82
1.24
0.98
1.00
2.28
4.29
|
|
|
|
|
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
|
5.26
3.94
0.22
0.20
0.17
0.16
0.15
0.12
0.24
0.54
1.30
|
4.24
0.16
0.12
0.11
0.07
0.08
0.08
0.07
0.11
0.34
0.65
|
|
|
|
|
|
