2004

8.1

1994

8.3

1976

8.1

1999

7.0

1996

7.5

1968

6.6

1989

7.4

2002

6.1

2004

6.1

2007

5.6

2002

5.6

2007

5.3

2016

6.5

1986

6.9

2003

6.3

1955

6.3

1986

6.1

1996

6.0

1987

6.8

1977

7.1