2018

6.0

1990

6.4

2017

6.9

1979

7.6

1978

6.9

1987

7.1

1995

6.6

2005

5.8

2020

6.3

2000

8.5

1957

6.2

2000

5.8

2010

7.3

1990

6.2

2010

6.8

2001

8.9

1987

7.4

1993

5.5

2021

5.3