1968

6.2

2005

5.9

2004

5.6

2007

6.9

1998

7.3

2017

3.3

1985

8.3

2023

7.7

2014

6.3

2021

10.0

1978

6.0

1995

7.7

2006

6.5

2002

6.0

1992

7.0

1978

7.5

2007

6.6

2002

6.4

2008

5.8

2008

5.6