1976

7.4

2006

5.6

1994

7.0

2007

5.6

1966

6.4

2007

5.2

2016

5.2

1988

6.0

2017

5.0

1994

6.1

1997

4.3

1989

5.8

1990

6.4

2003

6.2

2008

5.5

2000

5.5

1998

4.4

1994

7.5

2009

6.1

1995

5.4