1996

7.4

1993

6.7

1995

8.0

1999

7.6

2023

6.0

1994

5.3

2006

7.0

2005

6.9

1960

7.5

2005

6.1

2005

6.7

1999

7.2

2006

7.1

2007

7.3

2007

6.9

2006

6.9

1985

7.1

1990

5.8

2006

6.6

2018

7.0