2006

6.1

1980

8.4

2020

6.5

2019

6.7

2017

6.6

2013

6.5

2010

7.1

1975

5.8

2001

6.8

2015

7.4

1969

6.4

1993

6.5

6.6

1994

6.9

1999

5.9

1967

5.6

2015

6.5

2006

6.1

1980

6.4

2023

6.4