2005

6.3

1982

5.2

1974

3.3

1992

5.0

1968

5.3

2002

7.6

1970

0.0

2007

6.1

2008

5.4

1992

6.0

1976

1.0

2002

5.3

2008

4.5

2015

4.3

1969

2.0

1995

6.7

2002

7.2

1999

7.4

2003

5.9

2005

5.9