1967

6.2

1975

8.4

2002

5.4

1989

5.9

2009

6.2

2009

7.1

2018

6.4

2021

9.2

2004

6.8

1931

5.8

1979

6.7

2023

6.5

1989

5.8

1991

6.8

1994

4.6

2010

5.9

2002

7.5

2018

5.3

1990

7.5

2009

7.4