2004

8.3

2010

7.9

2014

7.7

5.8

1997

7.1

2011

7.8

1996

5.4

2014

7.3

1992

5.8

1975

8.3

1993

6.6

2007

7.4

1996

8.1

1993

7.9

2010

7.7

2009

7.2

1978

9.7

2023

7.0

2013

7.0

2021

6.8