1997

8.4

1983

4.1

2004

6.3

2002

5.8

1994

6.8

1999

6.4

1998

5.4

1980

6.0

1984

5.6

1953

7.2

1961

6.9

1992

7.8

2002

7.1

1980

7.0

1952

7.6

1978

6.8

2016

7.0

1961

6.7

1953

6.2

1961

7.9