1978

7.3

2004

7.1

2003

6.2

2013

7.7

2023

9.4

2004

6.4

2003

5.2

2021

7.8

1967

6.8

6.1

1981

5.1

2014

7.6

1988

5.3

1992

6.9

2022

6.3

2002

6.6

1949

6.1

1985

6.4

1969

7.7

5.6