1968

5.8

2007

5.4

1958

7.5

2003

8.1

2007

6.3

1995

7.7

1991

5.3

1989

5.3

1984

7.2

2001

5.0

2014

5.6

2016

0.0

2004

6.1

2006

4.8

2000

6.1

2006

6.4

2001

6.5

2003

6.1

2006

6.3

2008

6.4