1993

7.5

2004

6.0

2001

7.4

1999

6.5

2006

5.3

2007

7.0

2000

7.4

1968

8.1

2000

8.2

1984

6.6

2007

5.2

1999

6.2

1962

7.3

1999

6.8

2002

6.7

2008

6.8

2008

6.3

1971

6.1

2023

0.0

2021

6.7