1986

6.1

2000

7.0

1974

7.0

1988

6.3

2000

6.3

1986

6.6

1999

6.5

1957

5.7

2014

6.3

2005

4.0

2016

3.3

1992

5.9

1996

6.4

1970

7.2

1964

7.1

1975

5.6

2004

1.0

2007

6.4

1982

4.6

1976

6.6