1977

7.3

2006

7.5

1987

7.7

2018

7.0

2010

8.4

2012

8.5

1999

8.5

2013

8.3

2009

5.4

2003

7.4

1998

7.0

2009

7.5

1990

7.4

1999

7.1

2005

7.4

2025

8.2

2020

7.8

2001

6.6

2002

6.1

1967

7.7