1991

4.9

2012

6.8

1999

7.3

1987

7.3

2016

5.9

2005

5.1

1963

7.0

1988

6.6

1971

7.2

2002

6.0

2020

4.4

1998

6.0

2000

7.0

2019

5.8

2017

6.2

1983

7.6

2017

6.0

2019

6.8

1985

7.4

2006

6.2