2003

8.1

2002

6.4

1998

7.0

2017

5.0

2013

4.6

2005

6.3

2006

7.5

2002

6.3

1959

8.0

2000

7.1

1956

7.5

2005

7.1

2006

6.6

1994

6.8

1972

6.7

2005

4.2

1998

6.7

2003

3.9

1974

6.4

2008

4.4