1979

4.4

2021

10.0

2010

7.0

2005

6.8

2022

6.2

2002

5.4

2002

5.0

1989

5.9

2001

6.7

2009

7.7

1976

7.5

2006

5.6

1998

6.0

2004

7.3

2007

6.5

1999

7.4

2005

5.2

1967

6.4

1985

6.0

2011

7.0