1966

7.6

2018

5.4

1995

6.6

2018

7.0

1992

6.7

1996

5.9

1978

7.1

2002

5.2

1983

4.0

1980

5.3

1981

5.2

2009

6.5

1992

5.3

1988

5.6

2004

7.2

1994

5.0

2003

6.1

2001

6.0

2006

6.5

2008

4.8