1963

7.8

2001

7.6

2009

7.5

1989

7.8

2015

7.2

2010

7.6

1983

8.1

2017

8.3

1995

7.7

2007

6.7

2001

7.7

1975

7.3

1978

6.4

2013

6.4

2010

7.7

1990

8.0

1995

7.2

2007

8.0

2021

6.8

2023

8.8