1968

6.9

2014

6.1

1997

6.0

2016

8.1

1977

7.0

2012

5.4

2001

6.8

2000

6.4

1990

5.5

2003

5.7

1963

7.5

2002

7.4

2017

6.8

2014

6.1

2009

4.7

2002

6.5

2001

6.1

2021

6.8

1963

7.1

2020

8.4