1960

8.1

1979

6.0

1998

6.3

2007

6.0

2000

6.7

1958

6.4

2007

7.4

2008

5.2

2004

6.9

2005

6.5

1984

6.7

1977

6.0

1986

7.2

2002

6.3

1997

7.7

2016

4.9

2013

5.0

2014

6.4

1998

6.4

2022

7.5