1983

8.2

2005

7.4

1968

6.9

2003

8.6

1992

6.7

1983

7.4

1963

7.1

1969

7.9

2000

8.2

2009

7.0

1950

8.1

1973

7.7

1966

7.2

2020

6.4

2004

5.9

2009

5.9

2014

5.6

2004

6.8

2018

6.5

1994

7.5