1977

7.1

1999

7.2

2007

6.4

2008

6.1

1973

6.9

2008

5.4

2020

5.4

1980

7.0

2004

6.5

2001

6.3

2023

0.0

2005

7.2

2000

5.8

2000

7.3

1998

7.2

1998

6.5

2003

7.8

2005

6.9

1984

6.6

2015

6.0