1974

6.8

1993

5.0

1976

6.8

2006

6.2

2003

5.1

1992

7.1

1991

7.3

2004

6.1

2023

6.4

1983

5.4

1970

3.0

2005

3.6

1995

6.4

2001

4.8

1997

6.4

2005

5.8

2007

6.1

2015

5.6

2008

5.1

2000

7.0