1982

7.5

1968

8.1

2001

8.4

1994

8.5

1995

7.2

2008

7.7

1997

7.9

1996

7.0

1990

8.5

1989

8.3

2014

8.5

2023

8.1

2010

8.2

2004

6.7

2015

7.6

2013

6.9

2001

7.9

1999

8.0

2008

8.1

2002

7.4