2001

8.5

2019

6.2

2004

7.3

1992

7.7

1964

7.6

1977

6.5

1984

5.9

2015

6.0

2007

6.2

2008

5.2

2002

6.0

1963

7.2

2002

6.0

2006

5.1

1996

5.8

2013

6.9

1986

6.8

1994

6.2

1976

7.3

1993

7.8