2004

8.1

1994

8.3

1976

8.1

1987

6.7

1989

7.4

1965

7.1

1990

5.9

2002

6.1

2004

6.1

2010

6.0

2007

5.6

2002

5.6

2007

5.3

2016

6.5

2003

6.3

1955

6.3

1986

6.1

1987

6.8

1998

6.8

2002

6.8