1972

6.4

1993

5.8

6.5

2010

6.8

1974

7.0

1994

7.4

2007

5.7

2006

7.1

2023

6.9

1966

7.0

2014

7.1

2001

9.0

1978

6.7

2004

7.1

2022

7.2

2002

8.5

2017

5.9

2005

5.2

5.4