1982

8.1

2015

7.8

2017

7.6

2009

6.1

2007

6.0

2007

6.9

1996

8.0

1990

7.4

2023

7.6

1975

6.8

2006

6.6

1955

7.2

1983

5.5

2004

6.1

2006

5.1

1985

5.3

1991

6.8

1986

8.0

2024

7.2