1963

7.1

1967

6.6

1974

6.4

1981

6.5

1994

8.3

2001

6.2

1979

6.7

1991

6.8

1985

6.2

1993

7.0

1996

6.2

1995

6.2

1993

6.2

2020

7.5

1995

7.7

1971

6.2

2013

5.1

1992

6.7

1986

6.5

1997

6.2