1970

6.4

2015

7.5

1991

6.2

2005

6.5

1985

5.3

2020

8.5

2007

6.5

2002

6.9

2021

5.4

2023

7.4

1992

3.9

2000

6.1

1982

8.9

1992

6.3

1994

6.9

2023

6.0

1997

6.0

1960

6.2

2006

7.6

1994

7.4