1990

6.9

2007

8.5

2010

7.8

2008

8.9

1999

7.9

2009

6.4

1975

8.3

2022

8.3

1999

8.2

2022

8.4

2003

8.2

2021

7.9

2017

8.4

2005

8.0

1980

8.6

2001

7.6

2014

7.9

2007

7.2

2024

7.2

1997

7.3