1975

4.5

2021

6.2

1998

6.2

2009

8.5

2005

4.8

1967

5.7

1985

6.1

1996

9.5

2021

10.0

1992

6.0

2010

6.2

1976

5.9

2009

7.0

2016

7.1

2003

8.2

2003

7.0

2000

6.6

1947

6.7

1997

7.4