1973

6.6

2000

6.4

1995

6.5

1996

6.4

2005

5.4

2006

5.3

1993

6.7

1995

6.7

2016

6.1

1995

6.6

1993

6.9

1994

7.4

2019

6.0

1971

7.1

1991

6.7

2009

5.9

1984

6.0

2008

7.3

2006

4.4

2009

6.1