1948

7.4

1982

5.4

2006

6.6

1997

7.3

2010

4.4

1989

7.1

2014

8.5

1996

5.9

1966

6.5

1950

7.1

1951

7.4

1955

7.2

1991

6.5

2002

7.6

1993

6.9

1996

6.5

2004

5.7

1995

6.7