1983

6.8

2019

7.1

2016

9.3

1990

7.4

1980

6.5

1992

6.6

2007

7.9

1998

7.0

2000

6.2

1992

6.9

2019

6.9

1967

7.2

1989

8.0

1996

8.1

2006

7.8

2000

8.0

2018

10.0

1994

7.8

1997

6.9

1995

7.6