1997

6.6

2001

6.2

1987

7.1

2016

6.2

1997

7.1

2001

7.4

1994

8.5

1974

6.5

2001

6.7

1998

7.2

2012

6.7

1994

5.7

1966

6.7

1968

4.6

1996

6.8

1998

7.1

1990

7.0

1979

8.3

1995

7.6

1985

7.7