1971

7.2

2005

6.2

2005

6.8

1999

7.2

2006

7.1

2007

7.3

2006

6.8

1985

7.1

1990

5.8

2006

6.7

2001

7.4

2002

7.3

2000

7.1

2019

6.6

1973

7.0

1993

6.7

1956

7.9

2022

4.2

1937

7.8

1996

7.3