1976

4.9

2014

4.9

1968

6.0

2021

7.9

1998

5.8

2003

5.9

1992

7.1

2000

6.1

2007

5.7

1968

4.4

2016

7.8

2004

6.7

1995

6.4

2000

6.8

2016

7.0

2017

7.5

1977

6.9

2017

7.2

2024

6.8

2001

5.6