1992

4.7

2023

6.1

2021

5.3

1969

4.0

2001

7.8

1973

6.5

2005

6.8

2006

7.0

1980

8.4

2000

6.5

1972

5.1

2007

5.8

2006

5.2

1990

6.5

1994

6.1

2006

6.0

1996

6.9

1993

6.2

1998

6.0

2017

3.6