1969

3.6

2007

5.6

2022

6.6

2006

6.7

2001

7.0

1995

6.9

1997

4.4

2002

7.4

2004

6.5

2019

8.1

1986

5.8

2018

6.8

2001

4.6

2019

6.1

2008

6.2

2006

5.1

2016

6.1

1968

6.3

2002

6.9

1983

7.0