1994

6.8

1955

7.4

1974

7.3

2000

4.8

1994

5.7

1959

4.5

1998

5.6

1996

6.6

1990

5.9

2002

6.4

2012

3.9

1969

6.7

1976

4.5

2004

5.3

1993

6.5

2006

6.7

1967

7.3

1996

6.5

2010

6.9

2017

8.3