2006

6.6

1992

5.3

2003

6.8

2000

6.4

2005

5.5

1995

6.6

2003

5.2

2016

5.1

2008

6.9

1994

6.4

2004

6.2

1990

6.7

2017

5.0

1977

5.7

2017

6.9

1999

6.6

1989

6.1

1993

6.7

1962

5.6

1998

5.9