1993

5.8

1998

6.2

2008

8.4

2013

6.1

1992

6.7

1992

6.9

2017

8.0

2003

7.3

1990

6.1

1963

7.5

2018

8.2

1987

6.9

1994

6.1

1971

6.7

1980

6.4

1998

6.8

1968

6.0

1989

7.2

1986

6.9

2004

6.8